Karcher, H. Pinching implies strong pinching. (English) Zbl 0216.43803 Comment. Math. Helv. 46, 124-126 (1971). Cited in 5 Documents MSC: 53C20 Global Riemannian geometry, including pinching PDF BibTeX XML Cite \textit{H. Karcher}, Comment. Math. Helv. 46, 124--126 (1971; Zbl 0216.43803) Full Text: DOI EuDML OpenURL