F. Dylla, T. Mossakowski, T. Schneider, и D. Wolter. Proceedings of Conference On Spatial Information Theory 2013, том 8116 из Lecture Notes in Computer Science, стр. 516--536. Springer-Verlag Berlin Heidelberg, (2013)
M. Brill, T. Ertan, V. Luksch, и F. Schwab. Presentation at the 9th conference of the media psychology division of the German Psychological Society DGPs, Tübingen, Germany, (сентября 2015)
A. Frank, и R. Barrera. Design and Implementation of Large Spatial Databases, том 409 из Lecture Notes in Computer Science, Springer Berlin Heidelberg, (1989)