S. Banu, D. Uma, M. Ashfaque, Q. N.Naveed, and Q. Ahmed. International Journal on Recent and Innovation Trends in Computing and Communication, 3 (3):
1226--1231(March 2015)
J. Barron, D. Fleet, S. Beauchemin, and T. Burkitt. Computer Vision and Pattern Recognition, 1992. Proceedings CVPR '92., 1992 IEEE Computer Society Conference on, page 236-242. (1992)