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@article{CMH_1961__36_139225, author = {Jussi V\"ais\"al\"a and F.W. Gehring}, title = {On the {Geometric} {Definition} for {Quasiconformal} {Mappings.}}, journal = {Commentarii mathematici Helvetici}, pages = {19--32}, publisher = {mathdoc}, volume = {36}, year = {1961}, zbl = {0104.29903}, url = {http://geodesic.mathdoc.fr/item/CMH_1961__36_139225/} }
Jussi Väisälä; F.W. Gehring. On the Geometric Definition for Quasiconformal Mappings.. Commentarii mathematici Helvetici, Tome 36 (1961), pp. 19-32. http://geodesic.mathdoc.fr/item/CMH_1961__36_139225/