@article{MAN_1921__84_158888,
     author = {B. Baule},
     title = {\"Uber {Kreise} und {Kugeln} im {Riemannschen} {Raum.} {II.}},
     journal = {Mathematische Annalen},
     pages = {202--215},
     year = {1921},
     volume = {84},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1921__84_158888/}
}