M. Thonnat, S. Moisan, and M. Crubézy. Proceeding of the 1st International Conference on Vision
Systems, Las Palmas, Gran Canaria, Spain, Springer-Verlag, (January 1998)
A. Ji, C. Yeon, H. Kim, and G. Jo. Australian Conference on Artificial Intelligence, volume 4830 of Lecture Notes in Computer Science, page 377-386. Springer, (2007)