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Si tratta di alcune proprietà dell'equazioni differenziali ordinarie con coefficienti quasi-periodici.
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Eoppel, W.A. Almost periodic properties of ordinary differential equations. Annali di Matematica 76, 27–49 (1967). https://doi.org/10.1007/BF02412227
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DOI: https://doi.org/10.1007/BF02412227