1. Web grammars;Pfaltz,1969
2. Convexity in directed graphs;Pfaltz;J. Combinatorial Theory,1971
3. The PAX II picture processing system;Johnston,1970
4. Noise cleaning in digital pictures;Rosenfeld;EASCON ‘69 Record (IEEE Publ. 69C31-AES),1969
5. Isotonic grammars, parallel grammars, and picture grammars;Rosenfeld,1971