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Work supported in part by a NASA-AMES Research Center Grant NCA2-OR-295-502.
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Kiehn, R.M. Submersive equivalence classes for metric fields. Lett. Nuovo Cimento 14, 308–310 (1975). https://doi.org/10.1007/BF02746024
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DOI: https://doi.org/10.1007/BF02746024