[1]
Moßig, I. and Klein, J. 2003. The production cluster of the optical industry in the Wetzlar region: Starting points for a cluster oriented regional policy. Raumforschung und Raumordnung | Spatial Research and Planning. 61, 4 (Jul. 2003), 237–251. DOI:https://doi.org/10.1007/BF03182959.