Kovalenko , S. A., R. V. Ponomarenko, O. V. Kraynyuk, and O. V. Severynov. 2021. “Environmental Assessment of Surface Water Body Quality (on the Example of the Psel River) ”. Visnyk of V. N. Karazin Kharkiv National University Series «Еcоlogy», no. 25 (November), 31-41. https://doi.org/10.26565/1992-4259-2021-25-03.