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Klingenberg, W., Sakai, T. (1986). Remarks on the injectivity radius estimate for almost 1/4-pinched manifolds. In: Shiohama, K., Sakai, T., Sunada, T. (eds) Curvature and Topology of Riemannian Manifolds. Lecture Notes in Mathematics, vol 1201. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0075653
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DOI: https://doi.org/10.1007/BFb0075653
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