@article{10_14708_wm_v10i2_2152,
     author = {. Redaktor},
     title = {Zadania (171-190)},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 251--255},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1968},
     doi = {10.14708/wm.v10i2.2152},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v10i2.2152/}
}