LEHMANN, H. State and Tasks of Research on Karst Phenomena, a Summary. ERDKUNDE, [S. l.], v. 18, n. 2, p. 81–83, 1964. DOI: 10.3112/erdkunde.1964.02.01. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1429. Acesso em: 8 oct. 2024.