CHYKYN, N., O. SEVASTYANOVA, and B. PASALSKIY. “he orption of ons eavy etals by echnical ignins”. NTERNATIONAL CIENTIFIC-RACTICAL OURNAL OMMODITIES ND ARKETS, vol. 21, no. 1, June 2016, pp. 235-43, https://journals.knute.edu.ua/commodities-and-markets/article/view/1210.