H. Ackermann, B. Scheuermann, T. Chin, and B. Rosenhahn. 10th International Conference on Energy Minimization Methods in Computer Vision and Pattern Recognition (EMMCVPR), (2015)accepted.
K. Dill, J. Herzog, and M. Perkowski. Communications, Computers and Signal Processing,
PACRIM 1997, 2, page 823--826. Victoria, BC, Canada, (20-22 August 1997)