1. The quantitative study of shape and pattern perception;Attneave;Psychol, Bull.,1956
2. Comment in Methodologies of Pattern Recognition;Ball,1969
3. A transformation for extracting new descriptors of shape;Blum,1967
4. What mathematics can and cannot do for pattern recognition;Bremermann,1971
5. Transformational grammars and the organization of pictures;Clowes,1969