KOVALENKO , S. A.; PONOMARENKO, R. V.; KRAYNYUK, O. V.; SEVERYNOV , O. V. Environmental Assessment of Surface Water Body Quality (on the Example of the Psel River) . Visnyk of V. N. Karazin Kharkiv National University. Series Еcоlogy, n. 25, p. 31-41, 15 Nov. 2021.