Publications
[2017-28] On finitely generated submonoids of free groups .
Effects of pitch size and skill level on tactical behaviours of Association Football players during small-sided and conditioned games. International Journal of Sports Science & Coaching. 2014;9:993-1006.Edit
An application of first-order logic to the study of recognizable languages. Internat. J. Algebra Comput.. 2004;14:785-799.
A note on primeness of semigroup rings. Proc. Roy. Soc. Edinburgh Sect. A. 1992;120:191-197.
[2012-16] Groups and automata: a perfect match .
On unique factorization semilattices. Discuss. Math. Gen. Algebra Appl.. 2000;20:97-120.
The algebraic content of Bento Fernandes’s Tratado da arte de arismetica (1555). Historia Mathematica . 2008;35 :190-219.Edit
Conjugacy and transposition for inverse monoid presentations. Internat. J. Algebra Comput.. 1996;6:607-622.
a partitional clustering algorithm validated by a clustering tendency index based on graph theory. pattern recognition. 2006;39:776-788.Edit
A note on pure and $p$-pure languages. Acta Inform.. 2003;39:579-595.
Field dimension and skill level constrain team tactical behaviours in small-sided and conditioned games in football. Journal of sports sciences. 2014;32:1888-1896.Edit
On finite-index extensions of subgroups of free groups. J. Group Theory. 2010;13:365-381.Edit
Trees associated to inverse monoid presentations. J. Pure Appl. Algebra. 2001;165:307-335.
Luis Inacio Woodhouse (1857-1927). Vol 1. U. Porto Edições ed. 2018.Edit
Rational languages and inverse monoid presentations. Internat. J. Algebra Comput.. 1992;2:187-207.
The homomorphism problem for the free monoid. Discrete Math.. 2002;259:189-200.
On the circulation of algebraic knowledge in the Iberian península: the sources of Pérez de Moya's Tratado de Arithmetica (1573). Revue d'histoire des mathématiques . 2016;2:145-184.Edit