Shafarenko, M., and Vorobуova O. “RESEARCH OF METHANE PRODUCTION PROCESS FROM BIOGAS AND PYROLYSIS GAS: Array”. Municipal Economy of Cities. Series: «Economy Science», vol. 1, no. 161, Mar. 2021, pp. 280-3, https://khges.kname.edu.ua/index.php/khges/article/view/5747.