@misc{WM_1903_7_1-2_a7,
     title = {Kronika},
     journal = {Wiadomo\'sci Matematyczne},
     pages = {103--108},
     year = {1903},
     volume = {7},
     number = {1-2},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1903_7_1-2_a7/}
}