1. “Representations for rigid solids: Theory;Requicha;methods and systems,” Computing Surveys,1980
2. Proceedings of the Fifth International Conference on Pattern Recognition, Miami Beach, FL, December 1-4, 1980, session on 3-D Analysis, pp. 1064-1098.
3. “Machine perception of three-dimensional solids,”;Roberts,1977
4. “Obtaining shape from shading information,”;Horn,1975
5. “Understanding image intensities,”;Horn;Artificial Intelligence Journal,1977