A framework for realistic image synthesis. - Donald P. Greenberg; Kenneth E. Torrance; Peter Shirley; James Arvo; Eric P. Lafortune; James A. Ferwerda; Bruce Walter; Ben Trumbore; Sumanta N. Pattanaik; Sing-Choong Foo (SIGGRAPH, 1997)

Non-linear approximation of reflectance functions. - Eric P. Lafortune; Sing-Choong Foo; Kenneth E. Torrance; Donald P. Greenberg (SIGGRAPH, 1997)