Болатбекова, Кира Сулеймановна, and Мария Николаевна Мокеева. 2018. “Estimation of Quality of Water of the River Shlina (inflow Vyshnevolockogo of the Water Basin)”. HERALD OF TVER STATE UNIVERSITY. SERIES: GEOGRAPHY AND GEOECOLOGY, no. 1 (April):49-54. https://journal.tversu.ru/index.php/geo/article/view/13.