1. S. Baluja and D. Pomerleau. Non-intrusive gaze tracking using artificial neural networks. Technical Report CMU-CS-94-102, Carnegie Mellon University, 1994.
2. A. Blake, R. Curwen, and A. Zisserman. A framework for spatio-temporal control in the tracking of visual contours. Int. Journal of Computer Vision, 11(2):127–145, 1993.
3. S. Boverie, J. M. Leqellec, and A. Hirl. Intelligent systems for video monitoring of vehicle cockpit. 1998 International congress and exposition ITS: Advanced controls and vehicle navigation systems, pages 1–5, 1998.
4. D. F. Dinges, M. Mallis, G. Maislin, and J. W. Powell. Evaluation of techniques for ocular measurement as an index of fatigue and the basis for alertness management. Department of Transportation Highway Safety publication 808 762, April, 1998.
5. Y. Ebisawa. Unconstrained pupil detection technique using two light sources and the image difference method. Visualization and Intelligent Design in Engineering, pages 79–89, 1989.