Moll, P. 2000. 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. 58, 4 (Jul. 2000), 343–355. DOI:https://doi.org/10.1007/BF03183800.