HAHNE, Ulf. Some approaches to developing the central places system in Schleswig-Holstein. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 57, n. 2-3, p. 143–154, 1999. DOI: 10.1007/BF03184484. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1075.. Acesso em: 7 may. 2024.