Podeszwa, Ewelina, and Krzysztof Biernat. “Biogas As an Alternative Energy Source”. Studia Ecologiae et Bioethicae 12, no. 2 (June 30, 2014): 135–154. Accessed July 18, 2024. https://czasopisma.uksw.edu.pl/index.php/seb/article/view/3316.