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This research was completed under the suport of FINEP, FAPESP, CNPq and CAPES
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Cassago, H. Functional diferential inequalities. Bol. Soc. Bras. Mat 9, 1–11 (1978). https://doi.org/10.1007/BF02584789
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DOI: https://doi.org/10.1007/BF02584789