References
Wolf, J.: Isotropic manifolds of indefinite metric, Commentarii Math. Helv. 39 (1964), 21–64.
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Supported by the NSF grant MCS 77-04151.
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Kulkarni, R.S. The values of sectional curvature in indefinite metrics. Commentarii Mathematici Helvetici 54, 173–176 (1979). https://doi.org/10.1007/BF02566265
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DOI: https://doi.org/10.1007/BF02566265