Zawada, Marcin, Jan Kowalik, and Robert Kucęba. “BIOGAS PLANTS AS AN ELEMENT OF PROSUMER ENERGY DEVELOPMENT IN THE EUROPEAN UNION”. PEOPLE: International Journal of Social Sciences 3, no. 2 (September 18, 2017): 716–729. Accessed December 4, 2024. https://grdspublishing.org/index.php/people/article/view/1013.