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@article{MAN_1971__195_162205, author = {M Sugimoto and K. Shiohama}, title = {On the {Differentiable} {Pinching} {Problem.}}, journal = {Mathematische Annalen}, pages = {1--16}, publisher = {mathdoc}, volume = {195}, year = {1971}, zbl = {0218.53063}, url = {http://geodesic.mathdoc.fr/item/MAN_1971__195_162205/} }
M Sugimoto; K. Shiohama. On the Differentiable Pinching Problem.. Mathematische Annalen, Tome 195 (1971), pp. 1-16. http://geodesic.mathdoc.fr/item/MAN_1971__195_162205/