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References:
[1] R. Baer: Der Kern, eine characteristische Untergruppe. Composito Mathematica, vol. 1 (1935), pp. 254-283. MR 1556893
[2] A. H. Clifford, G. В. Preston: The algebraic theory of semigroups. vol. I (1961), American Mathematical Society. MR 0132791 | Zbl 0111.03403
[3] R. J. Warne, L. K. Williams: Characters on inverse semigroups. Czechoslovak Math. Journal, vol. 11 (1961), pp. 150-155. MR 0130315 | Zbl 0232.20137
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