Robert L. Cook, Kenneth E. Torrance. A reflectance model for computer graphics. In Doug Green, Tony Lucido, Henry Fuchs, editors, Proceedings of the 8th Annual Conference on Computer Graphics and Interactive Techniques, SIGGRAPH 1981, Dallas, Texas, USA, August 3-7, 1981. pages 307-316, ACM, 1981. [doi]
Abstract is missing.