Запорожець, О., В. Савченко, Г. Карабцов, and С. Карпенко. “Technologies and Equipment for Reduction of Mud and Tar Concentrations in Biogas”. Proceedings of National Aviation University, vol. 26, no. 4, Apr. 2005, pp. 144-7, doi:10.18372/2306-1472.26.1232.