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@article{MOMA_1997__124_4_178796, author = {Chang-Yu Xia}, title = {A {Sphere} {Theorem} for {Submanifolds} in a {Manifold} with {Pinched} {Positive} {Curvature.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {365--368}, publisher = {mathdoc}, volume = {124}, number = {4}, year = {1997}, zbl = {0905.53039}, url = {http://geodesic.mathdoc.fr/item/MOMA_1997__124_4_178796/} }
Chang-Yu Xia. A Sphere Theorem for Submanifolds in a Manifold with Pinched Positive Curvature.. Monatshefte für Mathematik, Tome 124 (1997) no. 4, pp. 365-368. http://geodesic.mathdoc.fr/item/MOMA_1997__124_4_178796/