"

Semigroups of order preserving mappings on a finite chain: a new class of divisors." *Semigroup Forum*. 54 (1997): 230-236.Website

"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

"Ranks of monoids of endomorphisms of a finite undirected path (DOI: 10.1007/s40840-019-00762-4)." *Bulletin of the Malaysian Mathematical Sciences Society*. 43 (2020): 1623-1645. AbstractWebsite

"The ranks of ideals in various transformation monoids." *Communications in Algebra (DOI:10.1080/00927872.2013.847946) *. 43.2 (2015): 674-692. AbstractWebsite

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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

"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.

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

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

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

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

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

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

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

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

"On semigroups of orientation-preserving transformations with restricted range." *Communications in Algebra (DOI:10.1080/00927872.2014.975345)*. 44.1 (2016): 253-264. AbstractWebsite

"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

" "

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

"On divisors of semigroups of order-preserving mappings of a finite chain." *Semigroup Forum*. 81 (2010): 551-554.Website

"On divisors of pseudovarieties generated by some classes of full transformation semigroups." *Algebra Colloq.*. 15 (2008): 581-588.

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