MOSSIG, Ivo; KLEIN, Jörg. 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, DE, v. 61, n. 4, p. 237–251, 2003. DOI: 10.1007/BF03182959. Disponível em: https://rur.oekom.de/index.php/rur/article/view/1586.. Acesso em: 15 jul. 2024.