Geodesic
Characterizing semigroups with commutative superextensions
Algebra and discrete mathematics, Tome 17 (2014) no. 2, pp. 161-192.

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We characterize semigroups $X$ whose semigroups of filters $\varphi(X)$, maximal linked systems $\lambda(X)$, linked upfamilies $N_2(X)$, and upfamilies $\upsilon(X)$ are commutative.
Keywords: Commutative semigroup, superextension, semigroup of filters, semigroup of linked upfamilies. 
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Taras Banakh; Volodymyr Gavrylkiv. Characterizing semigroups with commutative superextensions. Algebra and discrete mathematics, Tome 17 (2014) no. 2, pp. 161-192. http://geodesic.mathdoc.fr/item/ADM_2014_17_2_a1/

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