@article{MAN_1871__4_156528,
     author = {Affolter},
     title = {Lehrs\"atze und {Aufgaben} \"uber die {Kugel.}},
     journal = {Mathematische Annalen},
     pages = {185--194},
     publisher = {mathdoc},
     volume = {4},
     year = {1871},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1871__4_156528/}
}