@article{GDZPPN002108283,
title = {Manifolds with wells of negative curvature (with an Appendix by Daniel Ruberman).},
journal = {Inventiones mathematicae},
volume = {104},
year = {1991},
pages = {471-496},
zbl = {0722.53033},
url = {http://dml.mathdoc.fr/item/GDZPPN002108283}
}
Elworthy, K.D.; Rosenberg, Steven. Manifolds with wells of negative curvature (with an Appendix by Daniel Ruberman).. Inventiones mathematicae, Tome 104 (1991) pp. 471-496. http://gdmltest.u-ga.fr/item/GDZPPN002108283/