Papers in International Journals

• Bordalo, Gabriela Hauser; Silva, Ilda P. (1997) A characterization of finite modular pseudocomplemented lattices Discussiones Mathematicae: 17, 113-122.

• Kulikov, Gennady Yu (1997) A theory of symmetric one-step methods for differential-algebraic equations Russian Journal of Numerical Analysis and Mathematical Modelling: 12(6), 501-523.

• Lima, Pedro M.; Diogo, Teresa (1997) An extrapolation method for a Volterra integral equation with weakly singular kernel, Applied Numerical Mathematics: 24, 131--148.

• Kulikov, Gennady Yu (1997) Numerical methods solving the semi-explicit differential-algebraic equations by implicit multistep fixed stepsize methods Journal of Applied Mathematics and Computing: 4(2), 281-318.

• Alves, Carlos J. S.; Ha Duong, Tuong (1997) On Inverse Scattering by Screens Inverse Problems: 13(5), 1161-1176.

• Kulikov, Gennady Yu (1997) On the numerical solution of the Cauchy problem for a system of differential-algebraic equations by means of implicit Runge-Kutta methods with a variable integration step Moscow University Mathematics Bulletin: 52(5), 6-10.

• Branco, Mário J. J. (1997) The Kernel Category and Variants of the Concatenation Product Internat. J. Algebra Comput.: 7, 487-509.

• Pacheco, António; Prabhu, N.U. (1996) A Markovian storage model The Annals of Applied Probability: 6(1), 76-91.

• Gomes, Gracinda M. S.; Howie, John M. (1996) A P-theorem for inverse semigroups with zero Portugaliae Math.: 53 (3), 257-278.

• Kulikov, Gennady Yu (1996) Convergence theorems for iterative Runge-Kutta methods with a constant integration step Computational Mathematics and Mathematical Physics: 36(8), 1041-1054.

• Santa-Clara, Catarina; Smith, Patrick F. (1996) Extending modules which are direct sums of injective modules and semisimple modules Comm. Algebra: 24 (11), 3641-3651.

• Ferreira, Helena (1996) Extremal behaviour of stationary sequences under local restrictions on upcrossings Pub. Inst. Stat. Univ. Paris, XXXX: 1, 57-75.

• Guedes Soares, Carlos; Ferreira, Ana; Cunha, Carla (1996) Linear Models of the Time Series of Significant Wave Height in the Southwest Coast of Portugal Coastal Engineering: 29, 149-167.

• Bordalo, Gabriela Hauser; Monjardet, B. (1996) Reducible classes of finite lattices Order: 13, 379-390.

• Guedes Soares, Carlos; Ferreira, Ana (1996) Representation of Non-Stationary Time Series of Significant Wave Height With Autoregressive Models Probabilistic Engineering Mechanics: 11, 139-148.

• Prabhu, N.U.; Pacheco, António (1995) A storage model for data communication systems Queueing Systems. Theory and Applications: 19(1-2), 1-40.

• Ferreira, Helena (1995) Extremes of a random number of variables from periodic sequences Journal of Statistical Planning and Inference: 45(1-2), 133–141.

• Gomes, Gracinda M. S.; Howie, John M. (1995) Idempotent endomorphisms of an independence algebra of finite rank Proc. Edinb. Math. Soc.: 38, 107-116.

• Alves, Carlos J. S.; Ha Duong, Tuong (1995) Numerical Resolution of the Boundary Integral-Equations for Elastic-Scattering by a Plane Crack International Journal for Numerical Methods in Engineering: 38(14), 2347-2371.

• Diogo, Teresa; McKee, S; Tang, T. (1994) Collocation methods for Volterra integral equations with weakly singular kernel  Proceedings of the Royal Society of Edinburgh: 124A, 199--210.

• Ferreira, Helena (1994) Multivariate extreme values in T-periodic random sequences under mild oscillation restrictions Stochastic Processes and their Applications: 49(1), 111–125.

• Branco, Mário J. J. (1994) On the Pin-Thérien Expansion of Idempotent Monoids Semigroup Forum: 49, 329-334.

• Fountain, John; Gomes, Gracinda M. S. (1994) Proper left type-A covers Portugaliae Math.: 51 (4), 305-319.

• Bordalo, Gabriela Hauser; Priestley, H. A. (1994) Rees congruences in lattice-ordered algebras Publ. Math. Debrecen: 49, 355-364.

• Pacheco, António (1994) Second-order properties of the loss probability in M/M/s/s+c systems Queueing Systems. Theory and Applications: 15(1-4), 289-308.

• Bordalo, Gabriela Hauser; Priestley, H. A. (1994) Series-Parallel posets and relative Ockham lattices Order: 11, 281-305.

• Pacheco, António (1994) Some properties of the delay probability in M/M/s/s+c systems Queueing Systems. Theory and Applications: 15(1-4), 309-324.

• Kulikov, Gennady Yu (1994) The practical implementation and efficiency of the numerical methods for solving the Cauchy problem with an algebraic relation between the phase variables Computational Mathematics and Mathematical Physics: 34(11), 1389-1401.

• Gomes, Gracinda M. S. (1993) A characterisation of the group congruences on a semigroup Semigroup Forum: 46, 48-53.

• Ferreira, Helena (1993) Joint exceedances of high levels under a local dependence condition Journal of Applied Probability: 30(1), 112-120.

• Fountain, J.B.; Gomes, Gracinda M. S. (1993) Proper left type-A monoids revisited Glasgow Math. J.: 35, 293-306.

• Kulikov, Gennady Yu (1993) The numerical solution of an autonomous Cauchy problem with an algebraic constraint on the phase variables (the nonsingular case) Moscow University Mathematics Bulletin: 48(3), 8-12.

• Kulikov, Gennady Yu (1993) The numerical solution of the autonomous Cauchy problem with an algebraic relation between the phase variables Computational Mathematics and Mathematical Physic: 33(4), 477-492.

• T.Tang; S.McKee; Diogo, Teresa (1992)  Product integration methods for an integral equation with logarithmic singular kernel, Appl. Numer. Math. Applied Numerical Mathematics: 9, 259--266.

• Kulikov, Gennady Yu (1992) A method for the numerical solution of the autonomous Cauchy problem with an algebraic restriction of the phase variables Moscow University Mathematics Bulletin: 47(1), 14-18.

• Gomes, Gracinda M. S. (1992) Group congruences on eventually inverse semigroup Portugal. Math.: 49 (4), 417-428.

• Fountain, J.B.; Gomes, Gracinda M. S. (1992) Left proper E-dense monoids J. Pure Appl. Algebra: 80, 1-27.

• Gomes, Gracinda M. S.; Howie, J.M. (1992) On the ranks of certain semigroups of order-preserving transformations Semigroup Forum: 45, 272-282.

• Diogo, Teresa; McKee, S; Tang, T. (1991) A Hermite-type collocation method for the solution of an integral equation with a certain weakly singular kernel, IMA J. Numer. Anal.  IMA J. Numerical Analysis: 11, 595-605.

• Fountain, J.B.; Gomes, Gracinda M. S. (1990) The Szendrei expansion of a semigroup Mathematika: 37, 251-260.

• Gomes, Gracinda M. S. (1988) Orthodox congruences on regular semigroups Semigroup Forum: 37, 149-166.

• Gomes, Gracinda M. S.; Howie, J.M. (1987) Nilpotents in finite symmetric inverse semigroups Proc. Edinburgh Math. Soc.: 30, 383-395.

• Gomes, Gracinda M. S.; Howie, J.M. (1987) On the ranks of certain finite semigroups of transformations Math. Proc. Cambridge Philos. Soc.: 101, 395-403.

• Gomes, Gracinda M. S. (1986) Some results on congruences on R-unipotent semigroups Semigroup Forum: 33, 175-185.

• Gomes, Gracinda M. S. (1986) The lattice of R-unipotent congruences on a regular semigroup Semigroup Forum: 33, 159-173.

• Gomes, Gracinda M. S. (1985) R-unipotent congruences on regular semigroups Semigroup Forum: 31, 265-280.

• Gomes, Gracinda M. S. (1983)  On left quasinormal orthodox semigroups Proc. Roy. Soc. Edinburgh: 95A, 59-71.

• Blyth, T. S.; Gomes, Gracinda M. S. (1983) On the compatibility of the natural order on a regular semigroup Proc. Roy. Soc. Edinburgh: 94A, 79-84.

• Galvão, M. Luísa (1978) Ideals in the semiring N Portugal. Math.: 37, no 1-2, 113-117.

• Galvão, M. Luísa (1978) Les relations de congruence sur le demianneau N des nombres naturels Period. Math. Hungar.: 9, no 3, 231-235.