HARTMANN, Kilian. Ökobilanz Biogas. agricultural engineering.eu, [S. l.], v. 62, n. 2, p. 96–97, 2007. DOI: 10.15150/lt.2007.947. Disponível em: https://www.agricultural-engineering.eu/landtechnik/article/view/2007-62-2-096-097. Acesso em: 18 apr. 2024.