Petrova, Daria I., and Rafael Kh. Sungatullin. “Hydrogeochemical Characteristics of Underground Waters of Neogene Sediments Paleo-Volga Within the Territory of Kazan”. Proceedings of Voronezh State University. Series: Geology0, no. 1 (April 1, 2021): 114-123. Accessed December 5, 2025. https://journals.vsu.ru/geology/article/view/3343.