Boiaryn, M.V., Voloshyn, V.U. and Tsos, O.O. 2020. Ecological Condition of the Sapalayivka River in the Conditions of Lutsk Urbosystem. Visnyk of V. N. Karazin Kharkiv National University series «Еcоlogy». 23 (Nov. 2020), 21-29. DOI:https://doi.org/10.26565/1992-4259-2020-23-02.