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This work was partially supported by an N.S.E.R.C. Grant A7873 of Canada and N.S.F. Grant DMS-8601282 of the USA.
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Min-Oo, M., Ruh, E.A. L 2·Curvature pinching. Commentarii Mathematici Helvetici 65, 36–51 (1990). https://doi.org/10.1007/BF02566591
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DOI: https://doi.org/10.1007/BF02566591