Coloring with no 2-colored P 4 's, Electron, J. Combinat, pp.11-26, 2004. ,
Nonrepetitive colorings of graphs, Random Struct, Alg, vol.21, pp.336-346, 2002. ,
Some results on square-free colorings of graphs ,
Nonrepetitive colorings of graphs of bounded treewidth ,
Graph minors. V. Excluding a planar graph, Journal of Combinatorial Theory, Series B, vol.41, issue.1, pp.92-114, 1986. ,
DOI : 10.1016/0095-8956(86)90030-4
URL : http://doi.org/10.1006/jctb.1999.1919