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: http://195.37.233.11/landtechnik/article/view/1999-54-1-016-017. Acesso em: 3 mai. 2024.