1. Rizon, M., Kawaguchi, T.: Automatic Eye Detection using Intensity and Edge Information. In: Proc. TENCON, vol. 2 (2000)
2. Yilmaz, A., et al.: Automatic feature detection and pose recovery for faces. In: ACCV2002, Melbourne, Australia (2002)
3. Phimoltares, S., et al.: Locating Essential Facial Features using Neural Visual Model. In: Int. Conf. on Machine Learning and Cybernatics (2002)
4. Birchfield, S.: Elliptical head tracking using intensity gradients and color histograms. In: IEEE CVPR (1998)
5. Xin, Z., Yanjun, X., Limin, D.: Locating Facial Features with Color Information. In: IEEE Int. Conf. on Signal Processing, vol. 2 (1998)