MathSciNet bibliographic data

MR870911 (87k:53092) 53C20 Margerin, Christophe Un théorème optimal pour le pincement faible en dimension $4$. (French) [An optimal theorem for a weakly pinched $4$-manifold] C. R. Acad. Sci. Paris Sér. I Math. 303 (1986), no. 17, 877--880.

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