Domhardt, Hans-Jörg, and Jan Hilligardt. “Saarland’s „Commercial Site Potential Model”: A Method for the Identification and Assessment of Commercial Sites in Spatial Planning”. Raumforschung Und Raumordnung | Spatial Research and Planning, vol. 58, no. 1, Jan. 2000, pp. 24–34, https://doi.org/10.1007/BF03182919.