@article{DMGT_2009_29_3_a6,
     author = {Chartrand, Gary and Okamoto, Futaba and Rasmussen, Craig and Zhang, Ping},
     title = {The set chromatic number of a graph},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {545--561},
     publisher = {mathdoc},
     volume = {29},
     number = {3},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2009_29_3_a6/}
}