@article{MASLO_1997__47_5_a3,
     author = {Bukor, Jozef and Erd\"os, P\'al and \v{S}al\'at, Tibor and T\'oth, J\'anos T.},
     title = {Remarks on the $(R)$-density of sets of numbers. {II}},
     journal = {Mathematica slovaca},
     pages = {517--526},
     publisher = {mathdoc},
     volume = {47},
     number = {5},
     year = {1997},
     mrnumber = {1635220},
     zbl = {0939.11005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1997__47_5_a3/}
}