HELFFRICH, Dominik; OECHSNER, Hans. Hohenheimer Biogasertragstest. agricultural engineering.eu, [S. l.], v. 58, n. 3, p. 148–149, 2003. DOI: 10.15150/lt.2003.1461. Disponível em: https://www.agricultural-engineering.eu/landtechnik/article/view/2003-58-3-148-149. Acesso em: 23 apr. 2024.