@misc{WM_1903_7_5-6_a7,
     title = {Z {Obserwatoryum} im. {J\k{e}drzejewicza} w {Warszawie}},
     journal = {Wiadomo\'sci Matematyczne},
     pages = {324--326},
     publisher = {mathdoc},
     volume = {7},
     number = {5-6},
     year = {1903},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1903_7_5-6_a7/}
}