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References:
[1] PETRICH M.: Semigroups certain of whose subsemigroups have identities. Czechosl. Math. J. 16 (91), 1966, 186-198. MR 0200370 | Zbl 0143.03203
[2] WARNE R. J.: Homomorphisms of d-simple inverse semigroups with identity. Pacif. J. Math. 14, 1964, 1111-1122 MR 0167554 | Zbl 0158.02005
[3] KOLIBIAROVÁ B.: A note on the structure of some types of semigroups. Mat. Čas. 17, 1967, 131-141. MR 0228605 | Zbl 0153.34602
[4] CLIFFORD A. H., PRESTON G. B.: The algebraic theory of semigroups. Providence 1964.
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