VOLGMANN, Kati. Dynamics of Metropolitan Functions in German Polycentric Urban System: Spatial Pattern of Concentration and Functional Specialization. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 72, n. 1, p. 21–37, 2014. DOI: 10.1007/s13147-013-0264-5. Disponível em: https://rur.oekom.de/index.php/rur/article/view/649. Acesso em: 15 aug. 2026.