@Article{DemaDeWe13,
author = {Marc Demange and Dominique de Werra },
title = {On some coloring problems in grids},
journal = {Theoretical Computer Science},
volume = {472},
number = {11},
pages = {9-27},
doi = {10.1016/j.tcs.2012.10.046},
year = {2013}
}