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

"On orientation-preserving transformations of a chain." *Communications in Algebra (DOI 10.1080/00927872.2020.1870996)*. 49.6 (2021): 2300-2325. 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 semigroups of orientation-preserving transformations with restricted range." *Communications in Algebra (DOI:10.1080/00927872.2014.975345)*. 44.1 (2016): 253-264. Abstractauthorsfinalversion.pdfWebsite

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

"On the cyclic inverse monoid on a finite set." (Submitted). Abstract

"On the monoid of partial isometries of a cycle graph." *Turkish Journal of Mathematics* (In Press). Abstract

"On the monoid of partial isometries of a finite star graph." *Communications in Algebra (DOI 10.1080/00927872.2022.2121404; Online 14 Sep 2022)*. 51.3 (2023): 1028-1048. AbstractWebsite

"On the monoid of partial isometries of a wheel graph." (Submitted). Abstract

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

"On the Rank of Monoids of Endomorphisms of a Finite Directed Path." *Asian-European Journal of Mathematics (DOI 10.1142/S1793557123500699; Online 28 Oct 2022)*. 16.04 (2023): 2350069 (13 pages). AbstractWebsite

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

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

" "

Oriented transformations on a finite chain: another description." *Commun. Korean Math. Soc. (DOI 10.4134/CKMS.c220272; Online 12 July 2023)*. 38.3 (2023): 725-731. AbstractWebsite

"Partial Automorphisms and Injective Partial Endomorphisms of a Finite Undirected Path." *Semigroup Forum*. 103 (2021): 87-105. AbstractWebsite

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

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

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

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

" "

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

"Ranks and presentations of some normally ordered inverse semigroups." *Periodica Mathematica Hungarica (DOI 10.1007/s10998-022-00448-8)*. 85 (2022): 435-447. AbstractWebsite

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

"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

"