@article{MAN_1921__83_158873,
     author = {B. Baule},
     title = {\"Uber {Kreise} und {Kugeln} im {Riemannschen} {Raum} {(Erste} {Mitteilung)}},
     journal = {Mathematische Annalen},
     pages = {286--310},
     publisher = {mathdoc},
     volume = {83},
     year = {1921},
     zbl = {48.0640.05},
     url = {http://geodesic.mathdoc.fr/item/MAN_1921__83_158873/}
}