Lüthi, S. ., Thierstein, A. ., & Bentlage, M. . (2011). Interlocking Firm Networks in the German Knowledge Economy. On Local Networks and Global Connectivity. Raumforschung Und Raumordnung | Spatial Research and Planning, 69(3), 161–174. https://doi.org/10.1007/s13147-011-0088-0