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@article{IM_1989__97_2_143708, author = {P. Tukia}, title = {A rigidity theorem for {M\"obius} groups.}, journal = {Inventiones mathematicae}, pages = {405--432}, publisher = {mathdoc}, volume = {97}, number = {2}, year = {1989}, zbl = {0674.30038}, url = {http://geodesic.mathdoc.fr/item/IM_1989__97_2_143708/} }
P. Tukia. A rigidity theorem for Möbius groups.. Inventiones mathematicae, Tome 97 (1989) no. 2, pp. 405-432. http://geodesic.mathdoc.fr/item/IM_1989__97_2_143708/