REFERENCES:
 

1. D. J. Williams and M. Shah, " A fast algorithm for active contours and curvature     estimation," GVGIP : Image Understanding, vol 55, no.1, pp. 14-26, January 1992

2. Chenyang Xu, Student Member, IEEE, and Jerry L. Prince, Senior Member IEEE     "Snakes, Shapes, and Gradient Vector Flow"
    IEEE Transactions on Image Processing, Vol. 7, No.3, March 1998

3. Craig Dillabaugh "Active Contours" (pdf) March 2006

4. Discussion by Bob Sumner "Active Contour Models - Snakes CS 7322 Winter 1997

5. Brandon Itkowitz "Active Contour Modelling Using Snakes" Assignment P3,
    CAS CS585, November 1998

6. Open Source Computer Vision Library