Запорожець, О.І., В.І. Савченко, Г.П. Карабцов, and С.В. Карпенко. 2005. “Technologies and Equipment for Reduction of Mud and Tar Concentrations in Biogas”. Proceedings of National Aviation University 26 (4):144-47. https://doi.org/10.18372/2306-1472.26.1232.