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References:
[1] LJAPIN E. S.: Semigroups. Translations of Mathematical Monographs, Vol. 3, American Mathematical Society, Providence, R. I., 1963. MR 0167545
[2] NEUMANN B. H., TAYLOR T.: Subsemigroups of Nilpotent Groups. Proc. Roy. Soc. Seг. A., 274, 1963, 1-4. MR 0159884 | Zbl 0115.02502
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