T. Ropinski, K. Hinrichs, and F. Steinicke. Proceedings of the 4th ISPRS Workshop on Dynamic and Multi-dimensional GIS (DMGIS05), page 144--149. Pontypridd, ISPRS, (2005)
M. Ohzeki, H. Nishimori, and A. Berker. Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)