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@article{IM_1982__68_142934, author = {Christopher B. Croke}, title = {An {Eigenvalue} {Pinching} {Theorem.}}, journal = {Inventiones mathematicae}, pages = {253--256}, publisher = {mathdoc}, volume = {68}, year = {1982}, zbl = {0505.53018}, url = {http://geodesic.mathdoc.fr/item/IM_1982__68_142934/} }
Christopher B. Croke. An Eigenvalue Pinching Theorem.. Inventiones mathematicae, Tome 68 (1982), pp. 253-256. http://geodesic.mathdoc.fr/item/IM_1982__68_142934/