B. Naumova, Natalia, and Vera D. Strakhovenko. “Macro- and Trace Elements in Freshwater Lake Sediments in the South of West Siberia”. Asian Journal of Environment & Ecology 4, no. 4 (November 17, 2017): 1-11. Accessed October 27, 2021. https://www.journalajee.com/index.php/AJEE/article/view/9629.