@article{DMGT_2019_39_1_a4,
     author = {Rad, Nader Jafari and Rahbani, Hadi},
     title = {Some {Progress} on the {Double} {Roman} {Domination} in {Graphs}},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {41--53},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2019_39_1_a4/}
}