@article{MAN_1923__89_159009,
     author = {H. Mohrmann},
     title = {Bemerkung zu {E.} {Studys} {Aufsatz:} {{\guillemotright}\"Uber} {S.} {Lies} {Geometrie} der {Kreise} und {Kugeln}},
     journal = {Mathematische Annalen},
     pages = {315--320},
     publisher = {mathdoc},
     volume = {89},
     year = {1923},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__89_159009/}
}