Zvonok Evgeniy Alexandrovich. Eocene tetrapods of Ukraine: stratigraphic and paleogeographic significance : к.геол.н. : spec.. 04.00.09 - Палеонтологія і стратиграфія : presented. 2013-10-17; popup.evolution: .; Institute of Geological Sciences Nathional Academy of Sciences of Ukraine. – , 0413U005960.

Updated: 2026-11-08