@article{MASLO_2006__56_2_a7,
     author = {Raczek, Joanna and Lema\'nska, Magdalena and Cyman, Joanna},
     title = {Lower bound on the distance $k$-domination number of a tree},
     journal = {Mathematica slovaca},
     pages = {235--243},
     publisher = {mathdoc},
     volume = {56},
     number = {2},
     year = {2006},
     mrnumber = {2229344},
     zbl = {1150.05312},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_2006__56_2_a7/}
}