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@article{CMH_1962__37_139244, author = {Edgar Reich}, title = {On a characterization of quasiconformal mappings.}, journal = {Commentarii mathematici Helvetici}, pages = {44--48}, publisher = {mathdoc}, volume = {37}, year = {1962}, zbl = {0108.07701}, url = {http://geodesic.mathdoc.fr/item/CMH_1962__37_139244/} }
Edgar Reich. On a characterization of quasiconformal mappings.. Commentarii mathematici Helvetici, Tome 37 (1962), pp. 44-48. http://geodesic.mathdoc.fr/item/CMH_1962__37_139244/