TY - JOUR T1 - Illumination, Reflectance, and Reflection-Characterization of Human Faces under Illumination Variations Using Rank, Integrability, and Symmetry Constraints JF - Lecture Notes in Computer Science Y1 - 2004 A1 - Zhou,S. K A1 - Chellapa, Rama A1 - Jacobs, David W. VL - 3021 ER -