@article{DMGT_2010_30_1_a11,
     author = {Okamoto, Futaba and Salehi, Ebrahim and Zhang, Ping},
     title = {On multiset colorings of graphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {137--153},
     publisher = {mathdoc},
     volume = {30},
     number = {1},
     year = {2010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2010_30_1_a11/}
}