@article{AMI_2011_38_a4,
     author = {A. P. Kazemi and S. M. Sheikholeslami and L. Volkmann},
     title = {The {Roman} (k,k)-domatic number of a graph},
     journal = {Annales mathematicae et informaticae},
     pages = {45--57},
     publisher = {mathdoc},
     volume = {38},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2011_38_a4/}
}