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@article{IM_1995__120_2_144286, author = {E. Rips and Z. Sela}, title = {Canonical representatives and equations in hyperbolic groups.}, journal = {Inventiones mathematicae}, pages = {489--512}, publisher = {mathdoc}, volume = {120}, number = {2}, year = {1995}, zbl = {0845.57002}, url = {http://geodesic.mathdoc.fr/item/IM_1995__120_2_144286/} }
E. Rips; Z. Sela. Canonical representatives and equations in hyperbolic groups.. Inventiones mathematicae, Tome 120 (1995) no. 2, pp. 489-512. http://geodesic.mathdoc.fr/item/IM_1995__120_2_144286/