Estimation of the light source distribution and its use in integrated shape recovery from stereo and shading. - Darrell R. Hougen; Narendra Ahuja (ICCV, 1993)

Adaptive polynomial modelling of the reflectance map for shape estimation from stereo and shading. - Darrell R. Hougen; Narendra Ahuja (CVPR, 1994)

Shape from Appearance: A Statistical Approach to Surface Shape Estimation. - Darrell R. Hougen; Narendra Ahuja (ECCV (1), 1996)