Musil, Robert, and Jakob Eder. “Is There a Need for Proximity in the Urban Knowledge Economy? A Geostatistical Analysis of Research Cluster in Vienna”. Raumforschung Und Raumordnung | Spatial Research and Planning, vol. 75, no. 2, Apr. 2017, pp. 93–107, https://doi.org/10.1007/s13147-016-0458-8.