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Hunziker M, Machiavelo A, Park J. Chebyshev polynomials over finite fields and reversibility of σ-automata on square grids. Theoret. Comput. Sci.. 2004;320:465-483.Edit

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[2004-1] Matos J., Gama SM, Ruskin HJ, Duarte JA. An Econophysics Approach to the Portuguese Stock Index - PSI-20 .Edit

Matos J., Gama SM, Ryskin H., Duarte J.. An econophysics approach to the Portuguese Stock Index – PSI-20. Physica A. 2004;342:665-676.Edit

Almeida J, Zeitoun M. The equational theory of ω-terms for finite $\scr R$-trivial semigroups. In: Semigroups and languages. World Sci. Publ., River Edge, NJ; 2004. 1. p. 1-22p. Edit

Rosales J., García-Sánchez PA, García-García JI. Every positive integer is the Frobenius number of a numerical semigroup with three generators. Math. Scand.. 2004;94:5-12.Edit

García-Sánchez PA, Rosales JC. Every positive integer is the Frobenius number of an irreducible numerical semigroup with at most four generators. Ark. Mat.. 2004;42:301-306.Edit

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[2004-30] Antoneli F, Dias AP, Golubitsky M, Wang Y. Flow Invariant Subspaces for Lattice Dynamical Systems .Edit

Silva MC, Duarte AL, de Sá CC. Francisco Gomes Teixeira. CIM Bulletin. 2004;16:21-23.Edit

Silva PV. Free group languages: rational versus recognizable. Theor. Inform. Appl.. 2004;38:49-67.

[2004-15] Matos JM, Rocha Z. Frobenius-Padé approximants for d-orthogonal series: theory and computational aspects .

Matos J., da Rocha Z.. Frobenius-Padé approximants for d-orthogonal series: Theory and computational aspects. Applied Numerical Mathematics. 2004;52:89-112.Edit

Rosales J., García-Sánchez PA, García-García JI, Madrid J.. Fundamental gaps in numerical semigroups. J. Pure Appl. Algebra. 2004;189:301-313.Edit

Rosales J., García-Sánchez PA, García-García JI, Madrid J.. Fundamental gaps in numerical semigroups with respect to their multiplicity. Acta Math. Sin. (Engl. Ser.). 2004;20:629-646.Edit

Silva PV, Steinberg B. A geometric characterization of automatic monoids. Q. J. Math.. 2004;55:333-356.Edit

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[2004-18] Almeida J, Escada AP. The globals of pseudovarieties of ordered semigroups containing $B_2$ and an application to a proble .Edit

Almeida J, Escada AP. The globals of some subpseudovarieties of DA. Internat. J. Algebra Comput.. 2004;14:525-549.Edit

Aguiar P, Willshaw D. Hippocampal mossy fibre boutons as dynamical synapses. Neurocomputing. 2004;58:699-703.Edit

Alves JF, Araújo V. Hyperbolic times: frequency versus integrability. Ergodic Theory Dynam. Systems. 2004;24:329-346.Edit