T. Brox, A. Bruhn, and J. Weickert. Proceedings of European Conference on Computer Vision (ECCV 2006). Lecture Notes in Computer Science, 3951, Springer, (2006)
M. Eissele, O. Siemoneit, and T. Ertl. Proceedings of the IEEE International Conference on Cybernetics & Intelligent Systems and Robotics, Automation & Mechatronics (RAM 2006), (2006)