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@article{CMH_1962__37_139253, author = {Lipman Bers}, title = {The equivalence of two definitions of quasiconformal mappings.}, journal = {Commentarii mathematici Helvetici}, pages = {148--154}, publisher = {mathdoc}, volume = {37}, year = {1962}, zbl = {0108.07702}, url = {http://geodesic.mathdoc.fr/item/CMH_1962__37_139253/} }
Lipman Bers. The equivalence of two definitions of quasiconformal mappings.. Commentarii mathematici Helvetici, Tome 37 (1962), pp. 148-154. http://geodesic.mathdoc.fr/item/CMH_1962__37_139253/