Largest 2-generated subsemigroups of the symmetric inverse semigroup." *Proc. Edinb. Math. Soc. (2)*. 50 (2007): 551-561.Website

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

"On generators and relations for unions of semigroups." *Semigroup Forum*. 63 (2001): 49-62.

"Partial transformation monoids preserving a uniform partition." *Semigroup Forum (DOI 10.1007/s00233-014-9629-5)*. 90.2 (2015): 532-544. AbstractWebsite

"Relative abelian kernels of some classes of transformation monoids." *Bull. Austral. Math. Soc.*. 73 (2006): 375-404.Website

"Rees quotients of numerical semigroups." *Portugaliae Mathematica*. 70.2 (2013): 93-112. AbstractWebsite

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On semigroups whose idempotent-generated subsemigroup is aperiodic." *Internat. J. Algebra Comput.*. 14 (2004): 655-665.Website

"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

"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.

"The maximal subsemigroups of semigroups of transformations preserving or reversing the orientation on a finite chain." *Publicationes Mathematicae Debrecen*. 81.1-2 (2012): 11-29.

"A note on generators of the endomorphism semigroup of an infinite countable chain." *Journal of Algebra and its Applications (DOI: 10.1142/S0219498817500311)*. 16 (2017): 1750031 (9 pages). AbstractWebsite

"Presentations for some monoids of injective partial transformations on a finite chain." *Southeast Asian Bull. Math.*. 28 (2004): 903-918.

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

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

"The rank of the semigroup of all order-preserving transformations on a finite fence." *Bulletin of the Malaysian Mathematical Sciences Society (DOI: 10.1007/s40840-017-0598-1)* (In Press). AbstractWebsite

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"

Presentations for monoids of finite partial isometries." *Semigroup Forum (DOI: 10.1007/s00233-015-9759-4)*. 93.1 (2016): 97-110. AbstractWebsite

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

"On the rank of semigroups of transformations on a finite set with restricted range." *Algebra Colloquium*. 21.3 (2014): 497-510.

"Presentations for some monoids of partial transformations on a finite chain." *Comm. Algebra*. 33 (2005): 587-604.Website

"On the monoids of transformations that preserve the order and a uniform partition." *Communications in Algebra*. 39.8 (2011): 2798-2815.

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