GRAD, Karl. Getriebetechnologie für Traktoren. agricultural engineering.eu, [S. l.], v. 58, n. 3, p. 178–180, 2003. DOI: 10.15150/lt.2003.1475. Disponível em: http://195.37.233.21/landtechnik/article/view/2003-58-3-178-180. Acesso em: 22 feb. 2025.