Овчинникова, Марина Юрьевна, and Елена Александровна Жегалло. “Fossil Microorganisms and Tracks of Their Life in KMA Boxytes”. Proceedings of Voronezh State University. Series: Geology0, no. 2 (April 6, 2019): 141-145. Accessed December 15, 2025. https://journals.vsu.ru/geology/article/view/1803.