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Translated from Matematicheskie Zametki, Vol. 24, No. 2, pp. 195–206, August, 1978.
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Baskakov, A.G. Spectral criteria for almost periodicity of solutions of functional equations. Mathematical Notes of the Academy of Sciences of the USSR 24, 606–612 (1978). https://doi.org/10.1007/BF01105312
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DOI: https://doi.org/10.1007/BF01105312