@article{DMGT_2022_42_2_a18,
     author = {Chen, Hangdi and Lu, Changhong},
     title = {Roman {{2}-Domination} {Problem} in {Graphs}},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {641--660},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {2022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2022_42_2_a18/}
}