NIEMEIER, G. Citykern und City. ERDKUNDE, [S. l.], v. 23, n. 4, p. 290–306, 1996. DOI: 10.3112/erdkunde.1969.04.04. Disponível em: https://journals-test.ulb.uni-bonn.de/index.php/erdkunde/article/view/1596. Acesso em: 8 oct. 2024.