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Partially supported by the NSF, Sloan Foundation Fellow.
Partially supported by the Heinrich-Hertz-Stiftung.
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Spatzier, R.J., Strake, M. Some examples of higher ank manifolds of nonnegative curvature. Commentarii Mathematici Helvetici 65, 299–317 (1990). https://doi.org/10.1007/BF02566609
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DOI: https://doi.org/10.1007/BF02566609