Almeida J. Semigrupos finitos e álgebra universal Universidade de São Paulo, Instituto de Matemática e Estatí stica, São Paulo 1991.Edit

Almeida J. Semidirectly closed pseudovarieties of locally trivial semigroups. Semigroup Forum. 1990;40:315-323.Edit

Bokowski J, de Oliveira AG. Simplicial convex $4$-polytopes do not have the isotopy property. Portugal. Math.. 1990;47:309-318.Edit

Kha\u\i NT, Yakubovich SB. Some two-dimensional integral transformations of convolution type. Dokl. Akad. Nauk BSSR. 1990;34:396-398, 474.Edit

Almeida J. Semidirect products of pseudovarieties from the universal algebraist's point of view. J. Pure Appl. Algebra. 1989;60:113-128.Edit

da Silva MR, Rodrigues MJ. A simple alternative principle for rational τ-method approximation. In: Nonlinear numerical methods and rational approximation (Wilrijk, 1987). Vol 43. Reidel, Dordrecht; 1988. 4. p. 427-434p. (Math. Appl.; vol 43).Edit

Almeida J. Some pseudovariety joins involving the pseudovariety of finite groups. Semigroup Forum. 1988;37:53-57.Edit

Basto-Gonçalves J. Sufficient conditions for local controllability with unbounded controls. SIAM J. Control Optim.. 1987;25:1371-1378.

Almeida J. Some order properties of the lattice of varieties of commutative semigroups. Canad. J. Math.. 1986;38:19-47.Edit

Brito M. Sur l'encadrement optimal presque sûr dans un échantillon ordonné. C. R. Acad. Sci. Paris Sér. I Math.. 1986;303:821-824.

Almeida J. Some quasi-ordered classes of finite commutative semigroups. Semigroup Forum. 1985;32:189-200.Edit

Almeida J. Some algorithms on the star operation applied to finite languages. Semigroup Forum. 1984;28:187-197.Edit