1. On a general method of maximizing and minimizing among certain geometric problems;Dobkin,1979
2. Combinatorial Geometry in the Plane;Hadwiger,1964
3. Shapes of the future;Klee;Am. Scientist,1971
4. Computational geometry;Shamos,1978
5. Finding the extrema of a region;Snyder;IEEE Trans. Pattern Analysis and Machine Intelligence,1980