“Mineral-Raw Material Base of Non-Metallic Mineral Resources of Central Black Earth Region and Its Rational Use. Article 1. Situation of the Mineral-Raw Material Base of Non-Metal Mineral”. Proceedings of Voronezh State University. Series: Geology, no. 3 (August 28, 2018): 50–65. Accessed April 3, 2026. https://journals.vsu.ru/geology/article/view/1592.