2004, LINEAR ALGEBRA AND ITS APPLICATIONS, Fernandes,R
2004, International Journal of Mathematics and Mathematical Sciences, Esquivel,ML
2004, SEMIGROUP FORUM, Delgado,M;Fernandes,VH
2004, SEMIGROUP FORUM, Andre,JM
2004, COMMUNICATIONS IN ALGEBRA, Araujo,J;Konieczny,J
2004, COMMUNICATIONS IN ALGEBRA, Andre,JM
2004, MATHEMATICAL LOGIC QUARTERLY, Oitavem,I
2004, SEMIGROUPS AND LANGUAGES, Andre,JM
2004, SEMIGROUPS AND LANGUAGES, Araujo,J;Fountain,J
2004, SEMIGROUPS AND LANGUAGES, Delgado,M;Fernandes,VH