@misc{WM_1900_4_1-2-3_a5,
     title = {Obserwatoryum astronomiczne im. {Jana} {J\k{e}drzejewicza} w {Warszawie.} {Sprawozd.} za rok 1899},
     journal = {Wiadomo\'sci Matematyczne},
     pages = {90--92},
     publisher = {mathdoc},
     volume = {4},
     number = {1-2-3},
     year = {1900},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/WM_1900_4_1-2-3_a5/}
}