Oliynyk, O. Y., S. V. Telyma, Y. I. Kalugin, and Y. O. Oliynyk. “Substantiation of the Calculation Methods of the Nitrogen Removing (nitrification) in Bioreactors With Using on the Biofilm Models”. Environmental Safety and Natural Resources, vol. 38, no. 2, June 2021, pp. 18-38, doi:10.32347/2411-4049.2021.2.18-38.