@article{IM_1991__103_1_143866,
     author = {K.D. Elworthy and Steven Rosenberg},
     title = {Manifolds with wells of negative curvature (with an {Appendix} by {Daniel} {Ruberman).}},
     journal = {Inventiones mathematicae},
     pages = {471--496},
     publisher = {mathdoc},
     volume = {103},
     number = {1},
     year = {1991},
     zbl = {0722.53033},
     url = {http://geodesic.mathdoc.fr/item/IM_1991__103_1_143866/}
}