SAWYERR, N.; TROIS, C.; WORKNEH, T.; OKUDOH, V. An Overview of Biogas Production: Fundamentals, Applications and Future Research. International Journal of Energy Economics and Policy, [S. l.], v. 9, n. 2, p. 105–116, 2019. Disponível em: https://www.econjournals.com/index.php/ijeep/article/view/7375. Acesso em: 18 apr. 2024.