@article{MAN_1955__130_160452,
     author = {L. Bieberbach},
     title = {Zur {Euklidischen} {Geometrie} der {Kreisbogendreiecke.}},
     journal = {Mathematische Annalen},
     pages = {46--86},
     publisher = {mathdoc},
     volume = {130},
     year = {1955},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1955__130_160452/}
}