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Presented to the American Math. Soc., Sept. 1936 and Nov. 1936. See Abstracts 348 and 456, Bulletin of Am. Math. Soc.42 (1936), p. 631 and p. 822.
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Michal, A.D., Hyers, D.H. Differential invariants in a general differential geometry. Math. Ann. 116, 310–333 (1939). https://doi.org/10.1007/BF01597359
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DOI: https://doi.org/10.1007/BF01597359