@Article{fernandez:2011ole,
author = {A. Fern\'{a}ndez and M. X. \'{A}lvarez and F. Bianconi},
title = {Image classification with binary gradient contours},
journal = {Optics and Lasers in Engineering},
volume = {49},
pages = {1177-1184},
year = {2011},
doi = {10.1016/j.optlaseng.2011.05.003}
}