1. Representation and description of curved objects;Agin,1972
2. Baumgart, B. Computer graphics and visual perception. Ph.D. Thesis, Computer Science Dept., Stanford Univ., Stanford, Calif. (forthcoming).
3. Algorithms for finding zeros and extrema of functions without calculating derivatives;Brent,1971
4. Duda, R. and Hart, P. Pattern Classification and Scene Analysis. (in press) available in preprint form from Stanford Research Institute.