@article{MAN_1924__91_159039,
     author = {E. Study},
     title = {\"Uber {S.} {Lies} {Geometrie} der {Kreise} und {Kugeln.} (4. {Forts.)}},
     journal = {Mathematische Annalen},
     pages = {82--118},
     publisher = {mathdoc},
     volume = {91},
     year = {1924},
     url = {http://geodesic.mathdoc.fr/item/MAN_1924__91_159039/}
}