1. T.H. Cormen, C.E. Leiserson, and R.L. Rivest. Introduction to Algorithms. MIT Press, Cambridge, MA, 1990.
2. F. Harary. Graph Theory. Addison-Wesley Publ. Co., Reading, MA, 1969.
3. G.T. Herman. Geometry of Digital Spaces. Birkhauser Boston, Cambridge, MA, 1998.
4. Lecture Notes in Computer Science;TN Jones,1997
5. A. Kandel. Fuzzy Techniques in Pattern Recognition. John Wiley & Sons, New York, 1982.