1. Finite Semigroups and Universal Algebra;Almeida,1994
2. Some algorithmic problems for pseudovarieties;Almeida;Publ. Math. Debrecen,1999
3. On the decidability of iterated semidirect products with applications to complexity;Almeida;Proc. Lond. Math. Soc. (3),2000
4. Profinite identities for finite semigroups whose subgroups belong to a given pseudovariety;Almeida;J. Algebra Appl.,2003