TY - JOUR AU - Gromov, M. AU - Thurston, W. TI - Pinching constants for hyperbolic manifolds. JO - Inventiones mathematicae PY - 1987 VL - 89 SP - 1 EP - 12 KW - pinching theorems; examples; negative sectional curvature; constant negative curvature UR - http://eudml.org/doc/143471 ER -