1. The Scattering of Electromagnetic Waves from Rough Surfaces;Beckmann,1963
2. The Scattering of Electromagnetic Waves from Rough Surfaces;Beckmann,1963
3. Theory for off-specular reflection from roughened surface;Torrance;J. Optical Soc. America,1967
4. Computer Display of Curved Surfaces;Gouraud,1971
5. Illumination for Computer-Generated Images;Tuong Phong,1973