HASSINGER, H. Norbert Krebs zum Gedächtnis. ERDKUNDE, [S. l.], v. 2, n. 2, p. 200–202, 1948. DOI: 10.3112/erdkunde.1948.02.02. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/889. Acesso em: 12 dec. 2024.