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@article{IM_1987__89_143471, author = {M. Gromov and W. Thurston}, title = {Pinching constants for hyperbolic manifolds.}, journal = {Inventiones mathematicae}, pages = {1--12}, publisher = {mathdoc}, volume = {89}, year = {1987}, zbl = {0646.53037}, url = {http://geodesic.mathdoc.fr/item/IM_1987__89_143471/} }
M. Gromov; W. Thurston. Pinching constants for hyperbolic manifolds.. Inventiones mathematicae, Tome 89 (1987), pp. 1-12. http://geodesic.mathdoc.fr/item/IM_1987__89_143471/