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://www.erdkunde.uni-bonn.de/article/view/1596. Acesso em: 30 apr. 2025.