@article{MOMA_1981__91_178018,
     author = {G\"unter Aumann},
     title = {Zur {Theorie} verallgemeinerter torsaler {Strahlfl\"achen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {171--180},
     year = {1981},
     volume = {91},
     zbl = {0449.53005},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1981__91_178018/}
}