KALK, Wolf-Dieter; BERG, Werner; HÜLSBERGEN, Kurt-Jürgen. Kalkulation des fossilen Energieeinsatzes. agricultural engineering.eu, [S. l.], v. 57, n. 6, p. 338–343, 2002. DOI: 10.15150/lt.2002.1678. Disponível em: http://195.37.233.11/landtechnik/article/view/2002-57-6-338-343. Acesso em: 1 mai. 2024.