1. The analysis of convex blobs;Rosenberg,1972
2. Understanding shape: angles and sides;Davis;IEEE Trans. Comput.,1977
3. A corner finding algorithm for chain coded curves;Freeman;IEEE Trans. Comput.,1977
4. The curvature primal sketch;Asada;MIT AI Memo No 758,1984
5. Extraction of invariant picture substructures by computer;Sakai,1972