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

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Almeida J. Residually finite congruences and quasiregular subsets in uniform algebras. In: Proceedings of the Second Meeting of Portuguese Algebraists (Portuguese) (Porto, 1987). Univ. Porto, Porto; 1987. 1. p. 11-31p. Edit

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Basto-Gonçalves J. Control of a neoclassic economic model. Portugal. Math.. 1988;45:417-428.

Tuan VK, Yakubovich SB. Kantorovich-Lebedev transformation of functions that admit exponential growth. Mat. Fiz. Neline\uın. Mekh.. 1988:6-9, 85.Edit

Almeida J. A notion of branching rank for semilattices with descending chain condition. Order. 1988;4:397-409.Edit

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Almeida J. On pseudovarieties of monoids. In: Semigroups, theory and applications (Oberwolfach, 1986). Vol 1320. Springer, Berlin; 1988. 1. p. 11-17p. (Lecture Notes in Math.; vol 1320).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

Almeida J. The algebra of implicit operations. Algebra Universalis. 1989;26:16-32.Edit

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Labouriau IS. Degenerate Hopf bifurcation and nerve impulse. II. SIAM J. Math. Anal.. 1989;20:1-12.

Farr W., Li C, Labouriau IS, Langford W.. Degenerate Hopf bifurcation formulas and Hilbert's 16th problem. SIAM J. Math. Anal.. 1989;20:13-30.Edit