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"Congruences on monoids of transformations preserving the orientation of a finite chain." *J. Algebra*. 321 (2009): 743-757.Website

"Congruences on monoids of order-preserving or order-reversing transformations on a finite chain." *Glasg. Math. J.*. 47 (2005): 413-424.Website

"The cardinal of various monoids of transformations that preserve a uniform partition." *Bulletin of the Malaysian Mathematical Sciences Society*. 35.4 (2012): 885-896.

"The cardinal and the idempotent number of various monoids of transformations on a finite chain." *Bulletin of the Malaysian Mathematical Sciences Society*. 34.2 (2011): 79-85. Abstract

"Bilateral semidirect product decompositions of transformation monoids." *Semigroup Forum*. 82 (2011): 271-287. Abstract

"Automorphisms of partial endomorphism semigroups." *Publicationes Mathematicae Debrecen*. 79.1-2 (2011): 23-39.

"Abelian kernels, solvable monoids and the abelian kernel length of a finite monoid." *Semigroups and languages*. World Sci. Publ., River Edge, NJ, 2004. 68-85.

"Abelian kernels of some monoids of injective partial transformations and an application." *Semigroup Forum*. 61 (2000): 435-452.Website

"Abelian kernels of monoids of order-preserving maps and of some of its extensions." *Semigroup Forum*. 68 (2004): 335-356.Website

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