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@article{IM_1985__82_143300, author = {P. Tukia}, title = {Differentiability and rigidity of {M\"obius} groups.}, journal = {Inventiones mathematicae}, pages = {557--578}, publisher = {mathdoc}, volume = {82}, year = {1985}, zbl = {0564.30033}, url = {http://geodesic.mathdoc.fr/item/IM_1985__82_143300/} }
P. Tukia. Differentiability and rigidity of Möbius groups.. Inventiones mathematicae, Tome 82 (1985), pp. 557-578. http://geodesic.mathdoc.fr/item/IM_1985__82_143300/