@article{MZ_1949__51_169076,
     author = {H., Wittich},
     title = {Zum {Beweis} eines {Satzes} \"uber quasikonforme {Abbildungen}},
     journal = {Mathematische Zeitschrift},
     pages = {278--288},
     publisher = {mathdoc},
     volume = {51},
     year = {1949},
     zbl = {0030.35602},
     url = {http://geodesic.mathdoc.fr/item/MZ_1949__51_169076/}
}