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MR699491 53C20
Berger, Marcel Sur les variétés riemanniennes pincées juste au-dessous de $1/4$. (French) [Riemannian manifolds that are just less than $1/4$-pinched] Ann. Inst. Fourier (Grenoble) 33 (1983), no. 2, 135–150 (loose errata).
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