МатвєєвA. В., А. Д. Шоміна, І. В. Колосова, and В. В. Синєгубка. 2016. “Micropaleontological Characteristics of the Campanian-Maastrichtian Sediments in the Oskol River Basin”. Visnyk of V. N. Karazin Kharkiv National University. Series Geology. Geography. Ecology, no. 44 (December), 35-44. https://periodicals.karazin.ua/geoeco/article/view/7490.