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)*. Online (2022). AbstractWebsite

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

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

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

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