Publications
The pseudoidentity problem and reducibility for completely regular semigroups. Bull. Austral. Math. Soc.. 2001;63:407-433.Edit
Equidivisible pseudovarieties of semigroups. Publicationes Mathematicae. 2017;90(3-4):435-453.Edit
Estimation of hedonic responses from descriptive skin sensory data by chi-square minimization. Journal of Sensory Studies. 2006;21:2-19.Edit
Some algorithms on the star operation applied to finite languages. Semigroup Forum. 1984;28:187-197.Edit
Semigroups whose idempotents form a subsemigroup. Math. Proc. Cambridge Philos. Soc.. 1992;111:241-253.Edit
Matrix mortality and the Černý-Pin conjecture. In: Developments in language theory. Vol 5583. Springer, Berlin; 2009. 6. p. 67-80p. (Lecture Notes in Comput. Sci.; vol 5583).Edit
Sur certains systèmes d'équations avec contraintes dans un groupe libre. Portugal. Math.. 1999;56:409-417.Edit
On pseudovarieties, varieties of languages, filters of congruences, pseudoidentities and related topics. Algebra Universalis. 1990;27:333-350.Edit
Pointlike sets with respect to $\bf R$ and $\bf J$. J. Pure Appl. Algebra. 2008;212:486-499.Edit
Monoids respecting $n$-chains of intervals. J. Algebra. 1997;187:183-202.Edit
Semisimple synchronizing automata and the Wedderburn-Artin theory. In: Developments in Language Theory, 2014. Vol Developments in Language Theory. Russia, Ekaterinburg: Springer; 2014. 4. p. 49-60p. Edit
A notion of branching rank for semilattices with descending chain condition. Order. 1988;4:397-409.Edit
The globals of pseudovarieties of ordered semigroups containing $B_2$ and an application to a problem proposed by Pin. Theor. Inform. Appl.. 2005;39:1-29.Edit
Some key problems on finite semigroups. Semigroup Forum. 2002;64:159-179.Edit
Reducibility of pointlike problems. Semigroup Forum. 2017;94(2):325-335.Edit
Some order properties of the lattice of varieties of commutative semigroups. Canad. J. Math.. 1986;38:19-47.Edit
On regular implicit operations. Portugal. Math.. 1993;50:35-61.Edit
Iterated periodicity over finite aperiodic semigroups. European J. Combin.. 2014;37:115-149.Edit
[2017-25] On the insertion of n-powers .Edit
On hyperdecidable pseudovarieties of simple semigroups. Internat. J. Algebra Comput.. 2000;10:261-284.Edit
A note on the finite basis and finite rank properties for pseudovarieties of semigroups. Semigroup Forum. 2018;97:177-180.Edit
Commutative positive varieties of languages. Acta Cybernetica. 2017;23(1):91-111.Edit
On finite simple semigroups. Proc. Edinburgh Math. Soc. (2). 1991;34:205-215.Edit