MOLL, Peter. Problems and approaches to regional development in the European border-region of Saarland/Lorraine/Luxembourg/Rhineland-Palatinate/Walloon. Raumforschung und Raumordnung | Spatial Research and Planning, DE, v. 58, n. 4, p. 343–355, 2000. DOI: 10.1007/BF03183800. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1162.. Acesso em: 22 apr. 2025.