ECKEY, Hans-Friedrich; KOSFELD, Reinhold; TÜRCK, Matthias. Delineation of German labour market regions. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 64, n. 4, p. 299–309, 2006. DOI: 10.1007/BF03183178. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1387. Acesso em: 15 aug. 2026.