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Shandra, I.G. Pseudoconnections and Manifolds with Degenerate Metrics. Journal of Mathematical Sciences 119, 658–681 (2004). https://doi.org/10.1023/B:JOTH.0000011591.02399.45
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DOI: https://doi.org/10.1023/B:JOTH.0000011591.02399.45