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Translated from Issledovaniya po Prikladnoi Matematike, No. 17, pp. 46–50, 1990.
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Evlampiev, N.P., Filippov, I.E. Periodic solution of a linear functional equation with variable coefficients. J Math Sci 71, 2757–2759 (1994). https://doi.org/10.1007/BF02110581
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DOI: https://doi.org/10.1007/BF02110581