Cucchiella, Federica, Idiano D’Adamo, and Massimo Gastaldi. “Profitability Analysis for Biomethane: A Strategic Role in the Italian Transport Sector”. International Journal of Energy Economics and Policy 5, no. 2 (April 16, 2015): 440–449. Accessed June 3, 2023. https://www.econjournals.com/index.php/ijeep/article/view/1100.