References
Clifford, A.H. and G.B. Preston,The algebraic theory of semigroups II, Providence, R.I., 1967.
Nagy, A.,The separator of a subset of a semigroup, Publ. Mat., Debrecen, Tom. 27 (1980), 25–30.
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Nagy, A. On semigroups which are not divided by any non-trivial semigroup with an identity. Semigroup Forum 29, 251–252 (1984). https://doi.org/10.1007/BF02573330
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DOI: https://doi.org/10.1007/BF02573330