Hamm, Rüdiger, and Martin Wenke. “The Importance of Fachhochschulen (Universities of Applied Sciences) for Regional Economic Development: Experience from the Niederrhein University of Applied Sciences”. Raumforschung Und Raumordnung | Spatial Research and Planning, vol. 60, no. 1, Jan. 2002, pp. 28–36, https://doi.org/10.1007/BF03185691.