References
Graves, L., Nomizu, K.: On sectional curvature of indefinite metrics. Math. Ann.232, 267–272 (1978)
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Work partially supported by NSF grant MCS-7901310 at Brown University
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Dajczer, M., Nomizu, K. On sectional curvature of indefinite metrics. II. Math. Ann. 247, 279–282 (1980). https://doi.org/10.1007/BF01348960
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DOI: https://doi.org/10.1007/BF01348960