GRUBER, Waldemar. Trends bei der Biogastechnik. agricultural engineering.eu, [S. l.], v. 61, n. 6, p. 356–357, 2006. DOI: 10.15150/lt.2006.1128. Disponível em: https://www.agricultural-engineering.eu/landtechnik/article/view/2006-61-6-356-357. Acesso em: 27 apr. 2024.