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

" "

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.

"Ranks of monoids of endomorphisms of a finite undirected path (DOI: 10.1007/s40840-019-00762-4)." *Bulletin of the Malaysian Mathematical Sciences Society* (In Press). AbstractWebsite

"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

"Endomorphisms of the semigroup of order-preserving mappings." *Semigroup Forum*. 81 (2010): 277-285.Website

"The monoid of all injective order preserving partial transformations on a finite chain." *Semigroup Forum*. 62 (2001): 178-204.

"On semigroups of endomorphisms of a chain with restricted range." *Semigroup Forum (DOI: 10.1007/s00233-013-9548-x)*. 89.1 (2014): 77-104. AbstractWebsite

"Presentations for some monoids of partial transformations on a finite chain: a survey." *Semigroups, algorithms, automata and languages (Coimbra, 2001)*. World Sci. Publ., River Edge, NJ, 2002. 363-378.

"On the ranks of certain monoids of transformations that preserve a uniform partition." *Communications in Algebra*. 42.2 (2014): 615-636.

"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)*. 42.5 (2019): 2191-2211. AbstractWebsite

" "