@article{10_14708_wm_v9i2_2227,
     author = {M. Kalecki},
     title = {Uog\'olnienie postulatu {Bertranda}},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 219--220},
     year = {1967},
     volume = {9},
     number = {2},
     doi = {10.14708/wm.v9i2.2227},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v9i2.2227/}
}