@article{MAN_1894__44_157705,
     author = {A. Sch\"onflies},
     title = {Ueber {Kreisbogendreiecke} und {Kreisbogenvierecke}},
     journal = {Mathematische Annalen},
     pages = {105--124},
     publisher = {mathdoc},
     volume = {44},
     year = {1894},
     url = {http://geodesic.mathdoc.fr/item/MAN_1894__44_157705/}
}