@misc{WM_1901_5_1-2-3_a12,
     title = {Zadania},
     journal = {Wiadomo\'sci Matematyczne},
     pages = {139},
     publisher = {mathdoc},
     volume = {5},
     number = {1-2-3},
     year = {1901},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1901_5_1-2-3_a12/}
}