@misc{WM_1900_4_5-6_a4,
     title = {Kronika},
     journal = {Wiadomo\'sci Matematyczne},
     pages = {261--265},
     publisher = {mathdoc},
     volume = {4},
     number = {5-6},
     year = {1900},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1900_4_5-6_a4/}
}