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@article{MZ_1993__214_1_174566, author = {Greg\'orio Pacelli Bessa}, title = {Differentiable sphere theorems for {Ricci} curvature.}, journal = {Mathematische Zeitschrift}, pages = {245--260}, publisher = {mathdoc}, volume = {214}, number = {1}, year = {1993}, zbl = {0844.53028}, url = {http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174566/} }
Gregório Pacelli Bessa. Differentiable sphere theorems for Ricci curvature.. Mathematische Zeitschrift, Tome 214 (1993) no. 1, pp. 245-260. http://geodesic.mathdoc.fr/item/MZ_1993__214_1_174566/