Naing, Z. Y., A. Nistratov, and V. Klushin. “The Chemical Activation As a Prospect for the Transformation of Fossil Coal from the Kalewa Deposit into Active Coals”. International Journal of Biology and Chemistry, vol. 14, no. 1, July 2021, pp. 172-6, doi:10.26577/ijbch.2021.v14.i1.019.