References
  1. Foley; Van Dam; Feiner; and Hughes; Computer Graphics - Principle and Practice, Addison-Wesley, 1990.
  2. Rogers, D. F.; Procedural Elements of Computer Graphics, Mc Graw Hill, 1985.
  3. Chazelle, B.; and D.P. Dobkin; Intersection of convex objects in two and three dimensions Journal of ACM, Vol.34(1):1-27, Jan. 1987