“Biostratigraphic Characteristics of the Chaplygin Formation Devonian of the Central and Southeastern Parts of the Voronezh Anteclise”. Proceedings of Voronezh State University. Series: Geology, no. 1 (March 30, 2025): 40–63. Accessed March 30, 2026. https://journals.vsu.ru/geology/article/view/12778.