A bound on the chromatic number of the square of a planar graph.

Michael Molloy Mohammad R. Salavatipour A bound on the chromatic number of the square of a planar graph. 189-213 2005 94 J. Comb. Theory, Ser. B 2 http://dx.doi.org/10.1016/j.jctb.2004.12.005 db/journals/jct/jctb94.html#MolloyS05