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