@article{MAN_1947__120_160135,
     author = {Frank L\"obell},
     title = {Fl\"achenabbildungen mit gemeinsamem {Invariantensystem.}},
     journal = {Mathematische Annalen},
     pages = {21--35},
     year = {1947},
     volume = {120},
     zbl = {0029.22901},
     url = {http://geodesic.mathdoc.fr/item/MAN_1947__120_160135/}
}