@article{MZ_1920__6_167577,
     author = {P., Koebe},
     title = {Zum {Verzerrungssatze} der konformen {Abbildung}},
     journal = {Mathematische Zeitschrift},
     pages = {311--313},
     publisher = {mathdoc},
     volume = {6},
     year = {1920},
     zbl = {47.0327.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1920__6_167577/}
}