@article{10_14708_cm_v4i1_5448,
     author = {B. Szafirski},
     title = {O zbie\.zno\'sci pewnego ci\k{a}gu liczb do rozwarto\'sci zbioru},
     journal = {Commentationes Mathematicae},
     pages = { 77--81},
     year = {1960},
     volume = {4},
     number = {1},
     doi = {10.14708/cm.v4i1.5448},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v4i1.5448/}
}