@article{DMGT_2011_31_3_a0,
     author = {Volkmann, Lutz},
     title = {Signed domination and signed domatic numbers of digraphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {415--427},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2011_31_3_a0/}
}