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@article{CMH_1980__55_139839, author = {Raimo N\"akki and Bruce Palka}, title = {Quasiconformal circles and {Lipschitz} classes.}, journal = {Commentarii mathematici Helvetici}, pages = {485--498}, publisher = {mathdoc}, volume = {55}, year = {1980}, zbl = {0447.30005}, url = {http://geodesic.mathdoc.fr/item/CMH_1980__55_139839/} }
Raimo Näkki; Bruce Palka. Quasiconformal circles and Lipschitz classes.. Commentarii mathematici Helvetici, Tome 55 (1980), pp. 485-498. http://geodesic.mathdoc.fr/item/CMH_1980__55_139839/