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
2004, North-Holland Mathematics Studies, Karlovich,A
2004, Royal Society of Edinburgh - Proceedings A, Dacorogna,B;Ribeiro,AM