B. Kieler, W. Huang, J. Haunert, и J. Jiang. Advances in GIScience: Proceedings of the 12th AGILE International Conference on Geographic Information Science, June 2--5, 2009, Hannover, Germany, стр. 56--63. Springer, Berlin, Germany, (2009)
J. Haunert, и C. Brenner. Proceedings of the 17th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (ACM-GIS'09), November 4-6, 2009, Seattle, WA, USA, стр. 344--351. (2009)