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References:
[1] Clifford A. H., Preston G. B.: The algebraic theory of semigroups I. Amer. Math. Soc. Mathematical Surveys 7, 1961. MR 0132791
[2] Yamada M., Kimura N.: Note on idempotent semigroups, II. Proc. Japan Acad. 34 (1958), 110-112. MR 0098141 | Zbl 0081.25501
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