Robert A. Shepherd

Absolute measurement of diffuse and specular reflectance using an FTIR spectrometer with an integrating sphere

Robert A. Shepherd, 1990, Defense, Security, and Sensing.

Bidirectional reflectance analysis and visualization operations (BRAVO): a 3D visualization and processing tool for bidirectional reflectance distribution function (BRDF) data

Robert A. Shepherd, 1994, Optics & Photonics.