Asatryan, V., Dallakyan, M., Shokhin, I., Aroutiounian, R., & Matishov, G. (2017). STUDY OF SUSTAINABILITY AND CONFORMITY OF FUNCTIONING OF LOTIC ECOSYSTEMS ON THE EXAMPLE OF THE DZKNAGET RIVER (ARMENIA). Proceedings of the YSU B: Chemical and Biological Sciences, 51(3 (244), 186–192. https://doi.org/10.46991/PYSU:B/2017.51.3.186