@Book{Chartrand1986, author="G. Chartrand, L. Lesniak", title="Graphs and Digraphs", year="1986", publisher="Wadsworth and Brooks/Cole", address="Monterey" } @Article{Fertin2003, author="G. Fertin, E. Godard, A. Raspaud", title="Acyclic and k-distance coloring of the Grid", journal="Information Processing Letters", year="2003", pages="51--58", volume="87" } @Article{Heuvel2005, author="J. Van den Heuvel, S. McGuinness", title="Colouring the square of a planar graph", journal="J. Graph Theory", year="2005", pages="110--124", volume="42" }