@article{lev_snowb08,
author = {A. Levinshtein and C. Sminchisescu and S. Dickinson},
title = {{Qualitative 3D Surface Reconstruction from Images}},
journal = {Snowbird Learning},
year = {2008},
month = {April},
pdf = {http://sminchisescu.ins.uni-bonn.de/papers/qual3d-snowb.pdf 1}
}