2008, SEMIGROUP FORUM, Fernandes,VH

2008, ALGEBRA COLLOQUIUM, Fernandes,VH

2008, DUKE MATHEMATICAL JOURNAL, Tabuada,G

2008, DISCRETE MATHEMATICS, Sousa,T

2008, LINEAR ALGEBRA AND ITS APPLICATIONS, Johnson,CR;Duarte,AL;Saiago,CM

2008, LINEAR ALGEBRA AND ITS APPLICATIONS, Fernandes,R;Gomes,H;Martins,EA

2008, JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, Casimiro,AC;Porras,JMM;Martin,FJP

2008, COMMUNICATIONS IN ALGEBRA, Blyth,TS;Silva,HJ

2009, Information and Computation, Cain,AJ;Oliver,G;Ruskuc,N;Thomas,RM

2009, International Journal of Algebra and Computation, Cain,AJ;Maltcev,V