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David Baraff Andrew Witkin		Physically Based Modeling (Siggraph 2001 Course notes)
Per H. Christensen, David M. Laur, Julian Fong, Wayne L.Wooten,and Dana Batali.		"Ray Differentials and Multiresolution Geometry Caching for Distribution Ray Tracing in Complex Scenes". Computer Graphics Forum (Eurographics 2003 Conference Proceedings), pp. 543-552. Blackwell Publishers, September 2003.
Per H. Christensen and Dana Batali.		"An Irradiance Atlas for Global Illumination in Complex Production Scenes". Rendering Techniques 2004 (Proceedings of the Eurographics Symposium on Rendering 2004), pages 133-141. Eurographics / ACM, June 2004.