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

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

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"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.

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

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

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

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

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

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

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