1. Face locating and tracking for human computer interaction;Hunke,1994
2. Bradski, G. R. 1998, Computer vision face tracking for use in a perceptual user interface, Intel Technical Journal, http://developer.intel.com/technology/itj/q21998/articles/art 2a.htm
3. Colour indexing;Swain;International Journal of Computer Vision,1991
4. Kahn, R. E. Swain, M. J. Prokopowicz, P. N. Kirby, M. J. 1996, Real-time gesture recognition with the Perseus system, University of Chicago Technical Report, TR-96-04
5. Flachsbart, J. 1998, GARGOYLE: Active Vision Systems, http://www.cs.uchicago.edu/~josh/gargoyle/