Peter N. Belhumeur, David J. Kriegman, Alan L. Yuille. Shadows, Shading, and Projective Ambiguity. In David A. Forsyth, Joseph L. Mundy, Vito Di Gesù, Roberto Cipolla, editors, Shape, Contour and Grouping in Computer Vision. Volume 1681 of Lecture Notes in Computer Science, pages 132-154, Springer, 1999. [doi]
Abstract is missing.