Surface curvature from integrability. - Joel Fan; Lawrence B. Wolff (CVPR, 1994)

Segmentation of surface curvature using a photometric invariant. - Lawrence B. Wolff; Joel Fan (CVPR, 1994)

Surface Curvature and Shape Reconstruction from Unknown Multiple Illumination and Integrability. - Joel Fan; Lawrence B. Wolff (Comput. Vis. Image Underst., 1997)