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The work of these authors was done under the program “Sonderforschungsbereich Theoretische Mathematik” (SFB 40) at Bonn University. The first of these authors was supported by the Alexander von Humboldt-Stiftung.
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Sugimoto, M., Shiohama, K. & Karcher, H. On the differentiable pinching problem. Math. Ann. 195, 1–16 (1971). https://doi.org/10.1007/BF02059412
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DOI: https://doi.org/10.1007/BF02059412