@misc{WM_1907_11_Supplement_1_a0,
     title = {Zadania do rozwi\k{a}zania},
     journal = {Wiadomo\'sci Matematyczne},
     publisher = {mathdoc},
     volume = {11},
     number = {Supplement_1},
     year = {1907},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1907_11_Supplement_1_a0/}
}