“INVESTIGATIONS OF FORMATION OF PHYTOPLANKTON COMMUNITY IN THE ARPA RIVER (ARMENIA) AND ITS MAIN TRIBUTARIES”. Proceedings of the YSU B: Chemical and Biological Sciences, vol. 53, no. 1 (248), Apr. 2019, pp. 46-52, https://doi.org/10.46991/PYSUB.2019.53.1.046.