1. Gee, A., Cipolla, R.: Fast visual tracking by temporal census. Image and Vision Computing 14(2), 105–114 (1996)
2. Horprasert, T., Yacoob, Y., Davis, L.: Computing 3-d head orientation from a monocular image sequence. In: Proceedings of the IEEE International Conference on Automatic Face and Gesture Recognition, pp. 242–247 (1996)
3. Wang, J.-G., Sung, E.: Em enhancement of 3d head pose estimated by point at infinity. Image and Vision Computing 25(12), 1864–1874 (2007)
4. Niyogi, S., Freeman, W.: Example-based head tracking. In: Proceedings of the IEEE International Conference on Automatic Face and Gesture Recognition, pp. 374–378 (1996)
5. Stiefelhagen, R.: Estimating head pose with neural networks results on the pointing04 icpr workshop evaluation data. In: Proceedings of ICPR Workshop Visual Observation of Deictic Gestures (2004)