T. Usui, R. Behrends, J. Evans, and Y. Smaragdakis. Parallel Architectures and Compilation Techniques, 2009. PACT '09. 18th International Conference on, page 3--14. (September 2009)
C. Reynolds. SIGGRAPH '87: Proceedings of the 14th annual conference on Computer graphics and interactive techniques, page 25--34. New York, NY, USA, ACM, (1987)