ABEL, H. Der Stadtstaat Bremen. ERDKUNDE, [S. l.], v. 9, n. 2, p. 92–100, 1955. DOI: 10.3112/erdkunde.1955.02.02. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1132. Acesso em: 8 oct. 2024.