T. Sederberg, P. Gao, G. Wang, и H. Mu. Proceedings of the 20th annual conference on Computer graphics and interactive techniques, стр. 15--18. New York, NY, USA, ACM, (1993)
H. Hoppe. SIGGRAPH '97: Proceedings of the 24th annual conference on Computer graphics and interactive techniques, стр. 189--198. New York, NY, USA, ACM Press/Addison-Wesley Publishing Co., (1997)