GELLERT, J. F. Geographische Neuigkeiten aus Bulgarien. ERDKUNDE, [S. l.], v. 3, n. 1, p. 52–52, 1949. DOI: 10.3112/erdkunde.1949.01.06. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/915. Acesso em: 8 oct. 2024.