BOIARYN, M. V.; VOLOSHYN, V. U.; TSOS, O. O. Ecological Condition of the Sapalayivka River in the Conditions of Lutsk Urbosystem. Visnyk of V. N. Karazin Kharkiv National University. Series Еcоlogy, n. 23, p. 21-29, 21 Nov. 2020.