Black, M. J., Yacoob, Y. Apparatus and method for tracking facial motion through a sequence of images US Pat. 5,802,220, December 1995 (patent)

pdf on-line at USPTO [BibTex]

Black, M. J., Yacoob, Y. Apparatus and method for recognizing facial expressions and facial gestures in a sequence of images US Pat. 5,774,591, December 1995 (patent)

pdf on-line at USPTO [BibTex]

Black, M. J., Jepson, A. D. Image segmentation using robust mixture models US Pat. 5,802,203, June 1995 (patent)

pdf on-line at USPTO [BibTex]