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, Logic and Logical Philosophy, Kahle,R
2004, Royal Society of Edinburgh - Proceedings A, Dacorogna,B;Ribeiro,AM
2004, INTERNATIONAL JOURNAL OF ALGEBRA AND COMPUTATION, Delgado,M;Fernandes,VH;Margolis,S;Steinberg,B