@article{GDZPPN002106612,
title = {A rigidity theorem for M\"obius groups.},
journal = {Inventiones mathematicae},
volume = {96},
year = {1989},
pages = {405-432},
zbl = {0674.30038},
url = {http://dml.mathdoc.fr/item/GDZPPN002106612}
}
Tukia, P. A rigidity theorem for Möbius groups.. Inventiones mathematicae, Tome 96 (1989) pp. 405-432. http://gdmltest.u-ga.fr/item/GDZPPN002106612/