RUPPERT, K. Zur Definition des Begriffes Sozialbrache. ERDKUNDE, [S. l.], v. 12, n. 3, p. 226–231, 1958. DOI: 10.3112/erdkunde.1958.03.06. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1244. Acesso em: 8 oct. 2024.