Madzhd, Svitlana, Yana Pysanko, and Yelyzaveta Gogunska. 2019. “ENVIRONMENTAL ASSESSMENT OF SMALL RIVERS OF IRPIN RIVER BASIN BY EKOSYSTEM PRINCIPLE”. Proceedings of National Aviation University 77 (4):81-87. https://doi.org/10.18372/2306-1472.77.13501.