@article{MZ_1970__113_171276,
     author = {Karl Strambach},
     title = {Sph\"arische {Kreisebenen.}},
     journal = {Mathematische Zeitschrift},
     pages = {266--292},
     year = {1970},
     volume = {113},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__113_171276/}
}