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References:
[1] B. Pondělíček: On weakly commutative semigroups. Czechoslovak Math. Journal, 25 (1975), 20-23.
[2] M. Petrich: The maximal semilattice decomposition of a semigroup. Math. Zeitschrift, 85 (1964), 68-82. Zbl 0124.25801
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