Kuvandik, S. ., M. . Bakhodir, and S. . Sanat. “Investigation Of Changes In The Concentration Of Metals In The Process Of Bacterial Oxidation Of Flotation Concentrate”. The Journal of Contemporary Issues in Business and Government, vol. 27, no. 1, Feb. 2021, pp. 735-43, https://cibgp.com/au/index.php/1323-6903/article/view/593.