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Work supported by the Air Force Office of Scientific Research, Contract No. F 44620-67-C-0029.
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Ferus, D. The torsion form of submanifolds inE N . Math. Ann. 193, 114–120 (1971). https://doi.org/10.1007/BF02052819
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DOI: https://doi.org/10.1007/BF02052819