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            "author": "Hints, O. &  Nõlvak, J.", 
            "year": "1999", 
            "title": "Proposal for the lower boundary-stratotype of the Keila Regional Stage (Upper Ordovician)", 
            "title_original": null, 
            "language__value_en": "English", 
            "journal": 54, 
            "journal__journal_name": "Proceedings of the Estonian Academy of Sciences. Geology", 
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            "pages": "158-169", 
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        {
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            "reference": "Nazarov & Nõlvak, 1983", 
            "author": "Nazarov, B. &  Nõlvak, J.", 
            "year": "1983", 
            "title": "Radiolarians from the Upper Ordovician of Estonia", 
            "title_original": "Радиолярии из верхнего ордовика Эстонии", 
            "language__value_en": "Russian", 
            "journal": 185, 
            "journal__journal_name": "Proceedings of the Academy of Sciences of the Estonian SSR. Geology", 
            "journal_additional": null, 
            "volume": "32", 
            "book": null, 
            "pages": "1-8", 
            "doi": null, 
            "remarks": "2 fototahvlit"
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        {
            "id": 381, 
            "reference": "Popov & Nõlvak, 1987", 
            "author": "Popov, L. &  Nõlvak, J.", 
            "year": "1987", 
            "title": "Revision of the morphology and systematic position of the genus Acanthambonia (Brachiopoda, Inarticulata)", 
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            "language__value_en": "English", 
            "journal": 185, 
            "journal__journal_name": "Proceedings of the Academy of Sciences of the Estonian SSR. Geology", 
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            "author": "Nõlvak, J.", 
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            "title": "Ordovician chitinozoans", 
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            "journal": null, 
            "journal__journal_name": null, 
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            "reference": "Nõlvak et al., 1999", 
            "author": "Nõlvak, J., Grahn, Y. & Sturkell, E. F. F.", 
            "year": "1999", 
            "title": "Chitinozoan biostratigraphy of the Middle Ordovician Dalby Limestone in the Fjäcka section, Siljan district, Sweden", 
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            "journal": 54, 
            "journal__journal_name": "Proceedings of the Estonian Academy of Sciences. Geology", 
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            "author": "Paris, F. & Nõlvak, J.", 
            "year": "1999", 
            "title": "Biological interpretation and paleobiodiversity of a cryptic fossil group: the \"chitinozoan animal\"", 
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            "journal": 31, 
            "journal__journal_name": "Geobios", 
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            "author": "Nõlvak, J., Meidla, T. & Uutela, A.", 
            "year": "1995", 
            "title": "Microfossils in the Ordovician erratic boulders from Southwestern Finland", 
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            "journal": 199, 
            "journal__journal_name": "Bulletin of the Geological Society of Finland", 
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            "author": "Nõlvak, J.", 
            "year": "1980", 
            "title": "Chitinozoans in biostratigraphy of the northern East Baltic Ashgillian. A preliminary report", 
            "title_original": "", 
            "language__value_en": "English", 
            "journal": 5, 
            "journal__journal_name": "Acta Palaeontologica Polonica", 
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            "reference": "Wright & Nõlvak, 1997", 
            "author": "Wright, A. D. & Nõlvak, J.", 
            "year": "1997", 
            "title": "Functional significance of the spines of the Ordovician lingulate brachiopod Acanthambonia", 
            "title_original": null, 
            "language__value_en": "English", 
            "journal": 45, 
            "journal__journal_name": "Palaeontology", 
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            "author": "Grahn, Y.,  Nõlvak, J. &  Paris, F.", 
            "year": "1996", 
            "title": "Precise chitinozoan dating of Ordovician impact events in Baltoscandia", 
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            "journal": 196, 
            "journal__journal_name": "Journal of Micropalaeontology", 
            "journal_additional": null, 
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            "pages": "21-35", 
            "doi": null, 
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            "author": "Nõlvak, J. & Grahn, Y.", 
            "year": "1993", 
            "title": "Ordovician chitinozoan zones from Baltoscandia", 
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            "language__value_en": "English", 
            "journal": 55, 
            "journal__journal_name": "Review of Palaeobotany and Palynology", 
            "journal_additional": null, 
            "volume": "79", 
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            "pages": "245-269", 
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            "author": "Nõlvak, J. & Hints, O.", 
            "year": "2000", 
            "title": "Nature, outcrops", 
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            "journal__journal_name": null, 
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            "book": "Kink, H. & Raukas, A. Natural Heritage of Estonia 5. Paldiski, Pakri Peninsula and Pakri Islands", 
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            "year": "2006", 
            "title": "Early Ordovician scolecodonts and chitinozoans from Tallinn, North Estonia", 
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            "journal": 55, 
            "journal__journal_name": "Review of Palaeobotany and Palynology", 
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            "doi": "10.1016/j.revpalbo.2006.01.004 ", 
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            "author": "Nõlvak, J.", 
            "year": "2007", 
            "title": "A new chitinozoan species from the Upper Ordovician of the East Baltic", 
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            "journal": 279, 
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            "author": "Grahn, Y. & Nõlvak, J.", 
            "year": "2007", 
            "title": "Remarks on older Ordovician Chitinozoa and biostratigraphy of the Oslo Region, southern Norway", 
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            "journal": 85, 
            "journal__journal_name": "GFF", 
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            "reference": "Nõlvak & Bauert, G., 2006", 
            "author": "Nõlvak, J. &  Bauert, G.", 
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            "title": "Distribution of Ordovician chitinozoans", 
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            "author": "Hints, L., Hints, O., Nemliher, R. & Nõlvak, J.", 
            "year": "2007", 
            "title": "Hulterstad brachiopods and associated faunas in the Vormsi Stage (Upper Ordovician, Katian) of the Lelle core, Central Estonia", 
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            "author": "Hints, L., Oraspõld, A. & Nõlvak, J.", 
            "year": "2005", 
            "title": "The Pirgu Regional Stage (Upper Ordovician) in the East Baltic: lithostratigraphy, biozonation and correlation", 
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            "journal": 54, 
            "journal__journal_name": "Proceedings of the Estonian Academy of Sciences. Geology", 
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            "author": "Nõlvak, J., Meidla, T. & Hints, L.", 
            "year": "1989", 
            "title": "The Taučionys Formation (Holorhynchus beds) in the Iljinskoje boring (Pskov district).", 
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            "journal": 185, 
            "journal__journal_name": "Proceedings of the Academy of Sciences of the Estonian SSR. Geology", 
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            "reference": "Kaljo et al., 2008a", 
            "author": "Kaljo, D., Hints, L., Männik, P. & Nõlvak, J.", 
            "year": "2008", 
            "title": "The succesion of Hirnantian events based on data from Baltica: brachiopods, chitinozoans, conodonts, and carbon isotopes", 
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            "language__value_en": "English", 
            "journal": 279, 
            "journal__journal_name": "Estonian Journal of Earth Sciences", 
            "journal_additional": null, 
            "volume": "57", 
            "book": null, 
            "pages": "197-218", 
            "doi": "10.3176/earth.2008.4.01", 
            "remarks": null
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        {
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            "reference": "Nõlvak, 1972", 
            "author": "Nõlvak, J.", 
            "year": "1972", 
            "title": "A characterization of the boundary beds of the Kukruse and Idavere stages in the Lipu boring", 
            "title_original": "Kukruse ja idavere lademe piirikihtide iseloomustus Lipu puurprofiilis.", 
            "language__value_en": "Estonian", 
            "journal": null, 
            "journal__journal_name": null, 
            "journal_additional": null, 
            "volume": null, 
            "book": "Loodusuurijate Seltsi Aastaraamat, 61. kd", 
            "pages": "39-59", 
            "doi": null, 
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            "reference": "Kaljo et al., 1996", 
            "author": "Kaljo, D., Nõlvak, J. & Uutela, A.", 
            "year": "1996", 
            "title": "More about Ordovician microfossil diversity patterns in the Rapla section, Northern Estonia", 
            "title_original": null, 
            "language__value_en": "English", 
            "journal": 54, 
            "journal__journal_name": "Proceedings of the Estonian Academy of Sciences. Geology", 
            "journal_additional": null, 
            "volume": "45", 
            "book": null, 
            "pages": "131-148", 
            "doi": null, 
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            "id": 1405, 
            "reference": "Tammekänd et al., 2010", 
            "author": "Tammekänd, M., Hints, O. & Nõlvak, J.", 
            "year": "2010", 
            "title": "Chitinozoan dynamics and biostratigraphy in the Väo Formation (Darriwilian) of the Uuga Cliff, Pakri Peninsula, NW Estonia", 
            "title_original": null, 
            "language__value_en": "English", 
            "journal": 279, 
            "journal__journal_name": "Estonian Journal of Earth Sciences", 
            "journal_additional": null, 
            "volume": "59", 
            "book": null, 
            "pages": "25-36", 
            "doi": "10.3176/earth.2010.1.02", 
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            "reference": "Nõlvak & Hints, L., 1996", 
            "author": "Nõlvak, J. & Hints, L.", 
            "year": "1996", 
            "title": "Peetri hillock", 
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            "language__value_en": "English", 
            "journal": null, 
            "journal__journal_name": null, 
            "journal_additional": null, 
            "volume": null, 
            "book": "Third Baltic stratigraphical conference. Abstracts. Field guide.", 
            "pages": "84-88", 
            "doi": null, 
            "remarks": null
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        {
            "id": 1427, 
            "reference": "Nõlvak, 1996a", 
            "author": "Nõlvak, J.", 
            "year": "1996", 
            "title": "Pääsküla hillock", 
            "title_original": null, 
            "language__value_en": "English", 
            "journal": null, 
            "journal__journal_name": null, 
            "journal_additional": null, 
            "volume": null, 
            "book": "Third Baltic stratigraphical conference. Abstracts. Field guide.", 
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            "reference": "Hints, L. & Nõlvak, 1990", 
            "author": "Hints, L. & Nõlvak, J.", 
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            "title": "Locality 2:1. Peetri hill", 
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            "journal": null, 
            "journal__journal_name": null, 
            "journal_additional": null, 
            "volume": null, 
            "book": "Field Meeting Estonia 1990. An Excursion Guidebook. Eds:  Kaljo, D. & Nestor, H.", 
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            "doi": null, 
            "remarks": null
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        {
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            "reference": "Grahn & Nõlvak, 2010", 
            "author": "Grahn, Y. &  Nõlvak, J.", 
            "year": "2010", 
            "title": "Swedish Ordovician Chitinozoa and biostratigraphy: a review and new data", 
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            "language__value_en": "English", 
            "journal": 43, 
            "journal__journal_name": "Palaeontographica", 
            "journal_additional": "Abteilung B: Palaeobotany - Palaeophytology", 
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            "doi": null, 
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            "reference": "Saadre et al., 2004", 
            "author": "Saadre, T., Einasto, R., Nõlvak, J. & Stouge, S.", 
            "year": "2004", 
            "title": "Ordovician stratigraphy of the Kovel-1 well (Volkhov-Haljala) in the Volynia region, northwestern Ukraine", 
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            "journal": 417, 
            "journal__journal_name": "Bulletin of the Geological Society of Denmark", 
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            "journal": 300, 
            "journal__journal_name": "Bulletin of Geosciences", 
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            "pages": "11-26", 
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            "author": "Põldvere, Anne, Mens, K., Koppelmaa, H., Viira, V., Männik, P., Nõlvak, J. & Kivisilla, J.", 
            "year": "1999", 
            "title": "Taga-Roostoja (25A) drill core", 
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            "journal": 267, 
            "journal__journal_name": "Estonian Geological Sections", 
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            "year": "2001", 
            "title": "Valga (10) drill core", 
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            "journal__journal_name": "Estonian Geological Sections", 
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            "reference": "Põldvere, Anne (koost), 2002", 
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            "year": "2002", 
            "title": "Soovälja (K-1) drill core", 
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            "journal": 267, 
            "journal__journal_name": "Estonian Geological Sections", 
            "journal_additional": null, 
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            "reference": "Põldvere, Anne (koost), 2003", 
            "author": "Põldvere, Anne, Kleesment, A., Mens, K., Niin, M., Nestor, V., Märss, T., Kaljo, D., Männik, P., Nõlvak, J., Meidla, T., Martma, T., Kiipli, T., Kallaste, T., Shogenova, A., Jõeleht, A., Einasto, R. & Vaher, R. ", 
            "year": "2003", 
            "title": "Ruhnu (500) drill core", 
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            "language__value_en": "English", 
            "journal": 267, 
            "journal__journal_name": "Estonian Geological Sections", 
            "journal_additional": null, 
            "volume": null, 
            "book": "Ruhnu (500) drill core", 
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            "reference": "Põldvere, Anne (koost), 2005", 
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            "year": "2005", 
            "title": "Mehikoorma (421) drill core", 
            "title_original": null, 
            "language__value_en": "English", 
            "journal": 267, 
            "journal__journal_name": "Estonian Geological Sections", 
            "journal_additional": null, 
            "volume": null, 
            "book": "Mehikoorma (421) drill core", 
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            "reference": "Põldvere, Anne (koost), 2006", 
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            "year": "2006", 
            "title": "Kerguta (565) drill core", 
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            "journal": 267, 
            "journal__journal_name": "Estonian Geological Sections", 
            "journal_additional": null, 
            "volume": null, 
            "book": "Kerguta (565) drill core", 
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            "reference": "Põldvere, Anne (koost), 2008a", 
            "author": "Põldvere, Anne, Suuroja, K., Mens, K., Niin, M., Aaloe, A., Viira, V., Nõlvak, J. Uutela, A., Meidla, T., Tinn, O., Kiipli, T., Orlova, K., Kallaste, T., Shogenova, A. & Shogenov, K.", 
            "year": "2008", 
            "title": "Männamaa (F-367) drill core", 
            "title_original": null, 
            "language__value_en": "English", 
            "journal": 267, 
            "journal__journal_name": "Estonian Geological Sections", 
            "journal_additional": null, 
            "volume": null, 
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            "reference": "Hints, L. et al., 2010", 
            "author": "Hints, L., Hints, O., Kaljo, D., Kiipli, T., Männik, P., Nõlvak, J., Pärnaste, H.", 
            "year": "2010", 
            "title": "Hirnantian (latest Ordovician) bio- and chemostratigraphy of the Stirnas-18 core, western Latvia", 
            "title_original": null, 
            "language__value_en": "English", 
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            "journal__journal_name": "Estonian Journal of Earth Sciences", 
            "journal_additional": null, 
            "volume": "59", 
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            "pages": "1-24", 
            "doi": "10.3176/earth.2010.1.01", 
            "remarks": null
        }, 
        {
            "id": 1600, 
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            "year": "2006", 
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        {
            "id": 1669, 
            "reference": "Grahn & Nõlvak, 1993", 
            "author": "Grahn, Y. & Nõlvak, J.", 
            "year": "1993", 
            "title": "Chitinozoan dating of Ordovician impact events in Sweden and Estonia. A preliminary note", 
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        {
            "id": 1745, 
            "reference": "Nõlvak, 1999a", 
            "author": "Nõlvak, J.", 
            "year": "1999", 
            "title": "Ordovician chitinozoan biozonation of Baltoscandia", 
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        {
            "id": 1746, 
            "reference": "Sturkell et al., 2000", 
            "author": "Sturkell, E., Ormö, J., Nõlvak, J. & Wallin, A.", 
            "year": "2000", 
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            "title_original": "", 
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        }, 
        {
            "id": 1747, 
            "reference": "Nõlvak, 1984", 
            "author": "Nõlvak, J.", 
            "year": "1984", 
            "title": "Distribution of acid-resistant microfossils in the northern East Baltic Ashgillian", 
            "title_original": "Распространение кислотоустойчивых микрофоссилий в разрезах ашгилла Северной Прибалтики", 
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        }, 
        {
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            "year": "2010", 
            "title": "Biodiversity patterns of Ordovician marine microphytoplankton from Baltica: Comparison with other fossil groups and sea-level changes", 
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            "remarks": ""
        }, 
        {
            "id": 1749, 
            "reference": "Nõlvak & Goldman, 2007", 
            "author": "Nõlvak, J. & Goldman, D.", 
            "year": "2007", 
            "title": "Biostratigraphy and taxonomy of three-dimensionally preserved nemagraptids from the Middle and Upper Ordovician of Baltoscandia", 
            "title_original": null, 
            "language__value_en": null, 
            "journal": 35, 
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        {
            "id": 1750, 
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            "year": "2011", 
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        {
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        {
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            "reference": "Brenchley et al., 1997", 
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            "year": "1997", 
            "title": "New isotopic data solving an old biostratigraphic problem: the age of the upper Ordovician brachiopod Holorhynchus giganteus", 
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        {
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            "reference": "Brenchley et al., 2003", 
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            "title": "High-resolution stable isotope stratigraphy of Upper Ordovician sequences: Constraints on the timing of bioevents and environmental changes associated with mass extinction and glaciation", 
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        {
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        {
            "id": 1755, 
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        {
            "id": 1756, 
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        {
            "id": 1757, 
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        {
            "id": 1758, 
            "reference": "Nõlvak, 2005a", 
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        }, 
        {
            "id": 1759, 
            "reference": "Nõlvak, 2008", 
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            "year": "2004", 
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            "year": "2010", 
            "title": "Polar front shift and atmospheric CO2 during the glacial maximum of the Early Paleozoic Icehouse", 
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        }, 
        {
            "id": 1763, 
            "reference": "Podhalanska & Nõlvak, 1995", 
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            "year": "1995", 
            "title": "Endolithic trace-fossil assemblage in Lower Ordovician limestones from northern Estonia", 
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        {
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        }, 
        {
            "id": 1766, 
            "reference": "Nõlvak, 1989", 
            "author": "Nõlvak, J.", 
            "year": "1989", 
            "title": "Results of quantitative stratigraphic correlation of the Upper Ordovician in the Baltic: chitinozoans", 
            "title_original": "Результаты количественной стратиграфической корреляции верхнего ордовика Прибалтики: хитинозои", 
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            "book": "Quantitative stratigraphy - retrospective evaluation and future development. Eds: Oleynikov, A. & Rubel, M. ", 
            "pages": "139-154", 
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        }, 
        {
            "id": 1767, 
            "reference": "Nõlvak, 1986", 
            "author": "Nõlvak, J.", 
            "year": "1986", 
            "title": "Distribution of chitinozoans in the Upper Ordovician sections of Estonia", 
            "title_original": "Распространение хитинозой в разрезах верхнего ордовика Эстонии", 
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            "remarks": "Deponeeritud VINITI-sse 15.12.1986. Nr 8526-B86"
        }, 
        {
            "id": 1768, 
            "reference": "Nõlvak, 1988", 
            "author": "Nõlvak, J.", 
            "year": "1988", 
            "title": "Upper Ordovician chtinozoans of the Central-Lithuanian Depression", 
            "title_original": "Хитинозой верхнего ордовика Средне-Литовского прогиба", 
            "language__value_en": "Russian", 
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            "journal__journal_name": null, 
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        {
            "id": 1771, 
            "reference": "Paris et al., 1999b", 
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            "year": "1999", 
            "title": "Correlation of Ordovician regional chitinozoan biozonations", 
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            "journal": 68, 
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        }, 
        {
            "id": 1772, 
            "reference": "Modlinski et al., 2002a", 
            "author": "Modlinski, Z., Nõlvak, J. & Szymanski, B.", 
            "year": "2002", 
            "title": "Chitinozoan biozonation of the Ordovician succession in the borehole Proniewicze IG 1 (NE Poland)", 
            "title_original": "Zespoly Chitinozoa serii ordowickiej otworu Proniewicze IG 1 (NE Polska)", 
            "language__value_en": null, 
            "journal": 322, 
            "journal__journal_name": "Przeglad Geologiczny", 
            "journal_additional": null, 
            "volume": "50", 
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        }, 
        {
            "id": 1773, 
            "reference": "Modlinski et al., 2002b", 
            "author": "Modlinski, Z., Nõlvak, J. & Szymanski, B.", 
            "year": "2002", 
            "title": "Chitinozoan biozonation of the Ordovician succession in the borehole Ketrzyn IG 1 (NE Poland)", 
            "title_original": "Zespoly Chitinozoa serii ordowickiej otworu Ketrzyn IG 1 (NE Polska)", 
            "language__value_en": null, 
            "journal": 322, 
            "journal__journal_name": "Przeglad Geologiczny", 
            "journal_additional": null, 
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        }, 
        {
            "id": 1774, 
            "reference": "Modlinski et al., 2007", 
            "author": "Modlinski, Z., Nõlvak, J. & Szymanski, B.", 
            "year": "2007", 
            "title": "Stratigraphy of the Ordovician and Silurian boundary deposits in northeastern Poland and their correlation with the stratotype sections in Estonia", 
            "title_original": "Stratygrafia osadow pogranicza ordowiku i syluru polnocno-wschodniej Polski i ich korelacja ze stratotypowymi profilami Estonii", 
            "language__value_en": null, 
            "journal": 323, 
            "journal__journal_name": "Biuletyn Panstwowego Instytutu Geologicznego", 
            "journal_additional": null, 
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        {
            "id": 1776, 
            "reference": "Calner et al., 2010", 
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            "year": "2010", 
            "title": "Paleokarst evidence for widespread regression and subaerial exposure in the middle Katian (Upper Ordovician) of Baltoscandia: Significance for global climate", 
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        {
            "id": 1777, 
            "reference": "Goldman et al., 2007", 
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            "year": "2007", 
            "title": "The Black Knob Ridge section, southeastern Oklahoma, USA: The global stratotype-section and point (GSSP) for the base of Katian Stage of the Upper Ordovician series", 
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        }, 
        {
            "id": 1796, 
            "reference": "Nõlvak, 1979", 
            "author": "Nõlvak, J.", 
            "year": "1979", 
            "title": "Role of chitinozoans in the biostrtigraphy of the North Estonian Ashgillian", 
            "title_original": "Роль хитинозой в биостратиграфии ашгилла Северной Прибалтики", 
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        }, 
        {
            "id": 1807, 
            "reference": "Popov et al., 1982", 
            "author": "Popov, L. E., Zezina, O. N. & Nõlvak, J.", 
            "year": "1982", 
            "title": "Microstructure of the apical parts of inarticulates and its ecological importance", 
            "title_original": "Микроструктура апикальной части раковины беззамковых брахиопод и ее экологическое значение", 
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            "journal__journal_name": "Bulletin of Moscow Society of Naturalists. Geology", 
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        }, 
        {
            "id": 1808, 
            "reference": "Põlma & Nõlvak, 1984a", 
            "author": "Põlma, L. & Nõlvak, J.", 
            "year": "1984", 
            "title": "Paekna (Nõmmküla). Urge. Lohu", 
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        }, 
        {
            "id": 1809, 
            "reference": "Põlma & Nõlvak, 1984b", 
            "author": "Põlma, L. & Nõlvak, J.", 
            "year": "1984", 
            "title": "Stop 4:3 - Paekna (Nõmmküla); Stop 4:4 - Urge; Stop 4:5 - Lohu.", 
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        }, 
        {
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}