1. Computational Techniques in Visual Systems: Part I. The Overall Design;Arbib,1976
2. Finite Graphs and Networks: An Introduction with Applications;Busacker,1965
3. Understanding shape: Angles and sides;Davis;IEEE Trans. Computers,1977
4. Shape matching using relaxation techniques;Davis,1977
5. The generation of polygonal outlines of objects from gray level pictures;Feng;IEEE Trans. Circuits Syst.,1975