GURLITT, D.; SCHRÖDER, K. H.; SCHÜTTLER, A.; PAFFEN, K. Tagungen und Kongresse. ERDKUNDE, [S. l.], v. 2, n. 2, p. 345–351, 1948. DOI: 10.3112/erdkunde.1948.02.20. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/907. Acesso em: 8 oct. 2024.