1. C.M. Bishop. Neural Networks for Pattern Recognition. Clarendon Press, Oxford, 1995.
2. J. Bruske, E. Abraham-Mumm, J. Pauli, and G. Sommer. Head-pose estimation from facial images with subspace neural networks. In Proc. of Int. Neural Network and Brain Conference, pages 528–531, Beijing, China, 1998.
3. J. Bruske and G. Sommer. Intrinsic dimensionality extimation with optimally topology preserving maps. IEEE Trans. Pattern Analysis and Machine Intelligence, 20(5):572–575, 1998.
4. Q. Chen, H. Wu, T. Fukumoto, and M. Yachida. 3d head pose estimation without feature tracking. In Proc. Int. Conf. on Automatic Face and Gesture-Recognition, pages 88–93, Nara, Japan, April 14-16, 1998.
5. T.F. Cootes, G.J. Edwards, and C.J. Taylor. Active appearance models. In Proc. Fifth European Conference on Computer Vision, volume 2, pages 484–498, Freiburg, Germany, June 1-5, 1998.