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This author was partially supported by CNPq
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Hounie, J., Tavares, J. Uniqueness in the Cauchy problem for first order operator with Ck coefficients. Bol. Soc. Bras. Mat 12, 19–25 (1981). https://doi.org/10.1007/BF02584655
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DOI: https://doi.org/10.1007/BF02584655