Kautz, Jan Computer Graphics, MPI for Informatics, Max Planck Society;
Kautz, J., Sloan, P.-P., & Snyder, J. (2002). Fast Arbitrary BRDF Shading for Low-Frequency Lighting Using Spherical Harmonics. In Proceedings of the 13th Eurographics Workshop on Rendering (pp. 291-296). San Francisco, USA: ACM.