@misc{WM_1908_12_1-2-3-4_a9,
     title = {Og{\l}oszenie. {Zadanie} {Konkursowe} {Towarzystwa} {Naukowego} {Warszawskiego}},
     journal = {Wiadomo\'sci Matematyczne},
     pages = {147--149},
     publisher = {mathdoc},
     volume = {12},
     number = {1-2-3-4},
     year = {1908},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1908_12_1-2-3-4_a9/}
}