THIERSTEIN, Alain; LÜTHI, Stefan; HOYLER, Michael. Introduction: German Cities in the World City Network. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 69, n. 3, p. 141–146, 2011. DOI: 10.1007/s13147-011-0098-y. Disponível em: https://rur.oekom.de/index.php/rur/article/view/784.. Acesso em: 2 may. 2024.