@inproceedings { alldrin:2008a,
title = {Photometric Stereo With Non-Parametric and Spatially-Varying Reflectance},
booktitle = {IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
year = {2008},
address = {Anchorage, AK},
author = {Neil G. Alldrin and Todd Zickler and David Kriegman}
}