TROLL, C. Herbert Lehmann. ERDKUNDE, [S. l.], v. 20, n. 1, p. 1–5, 1966. DOI: 10.3112/erdkunde.1966.01.01. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1483. Acesso em: 7 oct. 2024.