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References:
[1] CLIFFORD A. H., und G. B. PRESTON: The Algebraic Theory of Semigroups. AMS, Mathematical Surveys 7, Vol 1. Providence, 1964 (2. Aufl.).
[2] JÜRGENSEN H.: Fastideale von Halbgruppen. Sѳmigroup Forum9, 1974, 261-270. MR 0379707 | Zbl 0292.20062
[3] VERBEEK L. A. M.: Union Extensions of Semigroups. Trans. AMS 150, 1970, 409-423. MR 0268310 | Zbl 0205.02003
[4] VERBEEK L. A. M.: Semigroup Extensions. Dissertation, Delft, 1968. MR 0245708
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