Simonyan, A.G., and G.P. Pirumyan. “ANALYSIS OF ENVIRONMENTAL STATUS OF THE RIVERS VOROTAN, SISIAN AND GORIS”. Proceedings of the YSU B: Chemical and Biological Sciences, vol. 51, no. 1 (242), Mar. 2017, pp. 12-16, doi:10.46991/PYSU:B/2017.51.1.012.