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@article{CMH_1981__56_139884, author = {Richard Fehlmann}, title = {Ueber extremale quasikonforme {Abbildungen.}}, journal = {Commentarii mathematici Helvetici}, pages = {558--580}, publisher = {mathdoc}, volume = {56}, year = {1981}, zbl = {0504.30008}, url = {http://geodesic.mathdoc.fr/item/CMH_1981__56_139884/} }
Richard Fehlmann. Ueber extremale quasikonforme Abbildungen.. Commentarii mathematici Helvetici, Tome 56 (1981), pp. 558-580. http://geodesic.mathdoc.fr/item/CMH_1981__56_139884/