@article{MZ_1955__62_169482,
     author = {Martin Barner},
     title = {Doppelverh\"altnisschafen auf {Regelfl\"achen.}},
     journal = {Mathematische Zeitschrift},
     pages = {50--93},
     publisher = {mathdoc},
     volume = {62},
     year = {1955},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1955__62_169482/}
}