References
Day, J. M.,Recurrent functions and semigroups, Semigroup Forum 10 (1975), 190–202.
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Communicated by Ŝ. Schwarz
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Olejĉek, V., Ŝipoŝ, J. On recurrent functions. Semigroup Forum 22, 235–241 (1981). https://doi.org/10.1007/BF02572802
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DOI: https://doi.org/10.1007/BF02572802