P. Vorst, S. Schneegans, B. Yang, and A. Zell. Proceedings of the 2008 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2008), page 1353-1358. Nice, France, (September 2008)
P. Vorst, and A. Zell. European Robotics Symposium 2008, volume 44/2008 of Springer Tracts in Advanced Robotics, page 273-282. Springer Berlin / Heidelberg, (February 2008)
S. Schneegans, P. Vorst, and A. Zell. Proceedings of the 3rd European Conference on Mobile Robots (ECMR 2007), page 241-246. Freiburg, Germany, (September 2007)