ARTICLES (in refereed journals):

“Coset Decomposition of Positively Self-Conjugate Inverse Submonoids of Polycyclic Monoids.” Semigroup Forum 66: (2003), 151—61.

“On the algebra of semigroup diagrams.” Internat. J. Algebra Comput. 7, no. 3 (1997), 313—38.

“On some congruences on factorizable semigroups.” Proceedings of the conference “Algebra and logic.” (Zagreb 1984): 69—73.