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.

"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.

"Abelian kernels of monoids of order-preserving maps and of some of its extensions." *Semigroup Forum*. 68 (2004): 335-356.Website

"Abelian kernels of some monoids of injective partial transformations and an application." *Semigroup Forum*. 61 (2000): 435-452.Website

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

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

"The cardinal and the idempotent number of various monoids of transformations on a finite chain." *Bulletin of the Malaysian Mathematical Sciences Society*. 34.2 (2011): 79-85. Abstract

"The cardinal of various monoids of transformations that preserve a uniform partition." *Bulletin of the Malaysian Mathematical Sciences Society*. 35.4 (2012): 885-896.

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

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

"A division theorem for the pseudovariety generated by semigroups of orientation preserving transformations on a finite chain." *Comm. Algebra*. 29 (2001): 451-456.Website

"Endomorphisms of semigroups of monotone transformations." *Journal of Algebra and its Applications (DOI 10.1142/S0219498824502244; Online 5 July 2023)* (2023). AbstractWebsite

"Endomorphisms of semigroups of order-preserving partial transformations." *Semigroup Forum (10.1007/s00233-018-9948-z)*. 99 (2019): 333-344. AbstractWebsite

"Endomorphisms of semigroups of oriented transformations." *Semigroup Forum (DOI 10.1007/s00233-022-10325-y; Online 2 Dec 2022)*. 106 (2023): 184-210. AbstractWebsite

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

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

"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.

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

"The monoid of all injective orientation preserving partial transformations on a finite chain." *Comm. Algebra*. 28 (2000): 3401-3426.Website

"A new class of divisors of semigroups of isotone mappings of finite chains." *Izv. Vyssh. Uchebn. Zaved. Mat.* (2002): 51-59.

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