1. A transformation for extracting new descriptors of shape;Blum,1967
2. Biological shape and visual science, I;Blum;J. Theor. Biol.,1973
3. Shape description using weighted symmetric axis features;Blum,1977
4. Thinning Algorithms for Grayscale Pictures;Dyer;University of Maryland Comp. Sci. TR-610,1977
5. Continuous skeletons from digitized images;Montanari;J. Assoc. Cornput. Mach.,1969