References
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2.Yu, Debevec, Malik, Hawkins, "Inverse Global Illumination: Recovering Reflectance Models of Real Scenes from Photographs", Proc. ACM SIGGRAPH 1999
3.Marschner S.R., Westin S.H., Lafortune P.F., and Torrance K.E., "Image-Based Bidirectional Reflectance Distribution Measurement", Applied Optics 39: 16, 2000