Rudnev, Vyacheslav V., and Mikhail V. Kumani. 2023. “Dynamics of Changes in Saprobity of Water Bodies of the Kursk Region”. Proceedings of Voronezh State University. Series: Geography. Geoecology, no. 1 (March), 122-34. https://doi.org/10.17308/geo/1609-0683/2023/1/122-134.