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References:
[1] A. H. Clifford, G. F, Preston: The algebraic theory of semigroups. Vol. I. 1964; VoL 11, 1967. Amer. Math. Soc. Providence, R. I.
[2] E. S. Ljapin: Semigroups. 2nd edition. Amer. Math. Soc. 1968. MR 0258991
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