Drozdenko, Tatyana, Sergey Fedorov, and Irina Kek. “SEASONAL DYNAMICS OF PHYTOPLANKTON AND SOME HYDROCHEMICAL INDICATORS OF THE PEIPSI-PSKOV LAKE”.
ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (June 16, 2021): 50–54. Accessed April 30, 2025.
https://journals.ru.lv/index.php/ETR/article/view/6557.