HOFFMANN, Anke; SEIPELT, Frank. Tracergas-Technik. agricultural engineering.eu, [S. l.], v. 53, n. 1, p. 30–31, 1998. DOI: 10.15150/lt.1998.2457. Disponível em: http://195.37.233.11/landtechnik/article/view/1998-53-1-030-031. Acesso em: 3 mai. 2024.