@article{MASLO_1988_38_3_a4,
     author = {Plesn{\'\i}k, J\'an},
     title = {Two heuristics for the absolute $p$-center problem in graphs},
     journal = {Mathematica slovaca},
     pages = {227--233},
     year = {1988},
     volume = {38},
     number = {3},
     mrnumber = {977900},
     zbl = {0654.05058},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1988_38_3_a4/}
}