Drozdenko, T., Fedorov, S., & Kek, I. (2021). SEASONAL DYNAMICS OF PHYTOPLANKTON AND SOME HYDROCHEMICAL INDICATORS OF THE PEIPSI-PSKOV LAKE. ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference, 1, 50-54. https://doi.org/10.17770/etr2021vol1.6557