Zakarina, N.A., L.D. Volkova, and O.V. Chshukina. “Natural Clays of the Kazakhstan Deposits for Catalysts of Cracking”. Eurasian Chemico-Technological Journal 4, no. 2 (March 20, 2002): 141–145. Accessed May 12, 2024. https://ect-journal.kz/index.php/ectj/article/view/283.