Klimenko, Yu. V., and Yu. B. Dorotyak. “Microfossils Distribution in the Callovian Sediments of the North-Western Part of Dnieper-Donets Depression”. Visnyk of V. N. Karazin Kharkiv National University, series "Geology. Geography. Ecology"0, no. 45 (March 17, 2017): 43-52. Accessed May 5, 2024. https://periodicals.karazin.ua/geoeco/article/view/8180.