KITTLER, G. A. Was ist Haken, was ist Pflug?. ERDKUNDE, [S. l.], v. 17, n. 3/4, p. 235–237, 1963. DOI: 10.3112/erdkunde.1963.03.10. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1419. Acesso em: 11 dec. 2024.