SONNENBERG, Hans; GRAEF, Michael. Energie aus der Landwirtschaft. agricultural engineering.eu, [S. l.], v. 54, n. 1, p. 16–17, 1999. DOI: 10.15150/lt.1999.2326. Disponível em: https://www.agricultural-engineering.eu/landtechnik/article/view/1999-54-1-016-017. Acesso em: 30 apr. 2024.