2002, PROCEEDINGS OF THE EDINBURGH MATHEMATICAL SOCIETY, Araujo,J

2002, ARCHIVE FOR MATHEMATICAL LOGIC, Oitavem,I

2002, Electronic Journal of Linear Algebra, Johnson,CR;Saiago,CM

2002, HISTORIA MATHEMATICA, Peckhaus,V;Kahle,R

2002, SYNTHESE, Kahle,R

2002, Semigroups, Algorithms, Automata and Languages, FERNANDES,VH

2002, ALGEBRA COLLOQUIUM, Araujo,J

2002, SEMIGROUP FORUM, Araujo,J

2003, FIBONACCI QUARTERLY, Brison,OJ;Nogueira,JE

2003, JOURNAL OF ALGEBRA, Araujo,J;Konieczny,J