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References:
[1] A. H. Clifford G. B. Preston: The algebraic theory of semigroups. Vol. 1. Math. Surveys No 7, Amer. Math. Soc, Providence, R. I., 1961. MR 0132791
[2] Š. Schwarz: The theory of characters of finite commutative semigroups. Czech. Math. J. 4 (79) (1954), 219-247. MR 0069815 | Zbl 0059.02001
[3] R. J. Warne L. K. Williams: Characters on inverse semigroups. Czech. Math. J. 11 (86) (1961), 150-155. MR 0130315
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