Papers in International Journals

• Guedes Soares, Carlos; Scotto, Manuel (2001) Modelling uncertainty in long-term predictions of significant wave height Ocean Engineering: 28, 329-342.

• Kulikov, Gennady Yu; Korneva, A.A. (2001) On efficient application of implicit Runge-Kutta methods to large-scale systems of index 1differential-algebraic equations Lecture Notes in Computer Science: 2073, 832-841.

• Araújo, Isabel M.; Branco, Mário J. J.; Fernandes, Vítor Hugo; Gomes, Gracinda M. S.; Ruskuc, N. (2001) On generators and relations for unions of semigroups Semigroup Forum: 63 (1), 49-62.

• Mateus, P. ; Pacheco, António; Pinto, J. Pinto; Sernadas, A.; Sernadas, C. (2001) Probabilistic situation calculus Annals of Mathematics and Artificial Intelligence: 32(1/4), 393-43.

• de Carvalho, Mamede; Lopes, Arminda; Scotto, Manuel; Swash, Michael (2001) Reproducibility of neurophysiological and myometric measurement in the ulnar nerve-abductor digiti minimi system Muscle & Nerve: 24, 1391-1395.

• Morais, M. C. ; Pacheco, António (2001) Some stochastic properties of upper one-sided X-bar and EWMA charts for mu in the presence of shifts in sigma Sequential Analysis-Design Methods and Applications: 20, 1-12.

• Kulikov, Gennady Yu; Shindin, S.K. (2000)  A technique for controlling the global error in multistep methods Computational Mathematics and Mathematical Physics: 40(9), 1255-1275.

• S. McKee; T.Tang; Diogo, Teresa (2000)  An Euler-type method for two-dimensional Volterra integral equations of the first kind  IMA J. Num. Anal.: 3, 423-440.

• Kulikov, Gennady Yu (2000) A local-global version of a stepsize control for Runge-Kutta methods Journal of Applied Mathematics and Computing: 7(2), 289-318.

• Ferreira, Helena (2000) A note on extremes of concomitants of order statistics Extremes: 3(4), 385-392.

• Diogo, Teresa; Franco, NB; Lima, Pedro M. (2000) Analysis of product integration methods for a class of singular Volterra integral equations Tendências da Matemática Aplicada e Computacional (TEMA ): 1(2), 373--387.

• Gomes, Gracinda M. S.; Gould, Victoria (2000) Graph expansions of unipotent monoids Comm. Algebra: 28 (1), 447-463.

• Scotto, Manuel; Guedes Soares, Carlos (2000) Modelling the long-term time series of significant wave height with non-linear threshold models Coastal Engineering: 40, 313-327.

• Santa-Clara, Catarina; Smith, Patrick F. (2000) Modules which are self-injective relative to closed submodules Contemp. Math.: 259, 487-499.

• Giraldes, Emília; Gomes, Gracinda M. S.; McAlister, D. B. (2000) On a class of lattice ordered inverse semigroups J. Algebra: 230, 496-517.

• Kulikov, Gennady Yu; Shindin, S.K.  (2000) On multistep extrapolation methods for ordinary differential equations Doklady Mathematics: 61(3), 357-360.

• Andrianova, N.A.; Kulikov, Gennady Yu (2000) On pseudodiagonally optimal Runge-Kutta simple iteration methods for systems of differential- algebraic equations of index 1 Computational Mathematics and Mathematical Physics: 40(7), 1027-1045.

• Morais, M. C. ; Pacheco, António (2000) On the performance of combined EWMA schemes for mu and sigma: a Markovian approach Communications in Statistics - Simulation and Computation: 29(1), 153-174.

• Fountain, John; Gomes, Gracinda M. S. (2000) Primitive inverse congruences on categorical semigroups Proc. Edinburgh Math. Soc.: 43, 395-413.

• Araújo, João; Silva, F. C. (2000) Semigroups of linear endomorphisms closed under conjugation Comm. Algebra: 28 (8), 3679-3689.

• Gouveia, M. J.; (previously Saramago, M. J.) (2000) Some remarks on dualisability and endodualisability Algebra Universalis: 43, 197-212.

• Antunes, Nelson; Pacheco, António; Rocha, R. (2000) Traffic modeling for broadband wireless networks: the highway scenario Advances in Performance Analysis: 3(2), 109-136.

• Kulikov, Gennady Yu; Shindin, S.K. (1999) A local-global stepsize control for multistep methods applied to semi-explicit index 1 differential-algebraic equations Journal of Applied Mathematics and Computing: 6(3), 463-492.

• Fountain, John; Gomes, Gracinda M. S.; Gould, Victoria (1999) A Munn type representation for a class of E-semiadequate semigroups J. Algebra: 218, 693-714.

• Morais, M. C. ; Pacheco, António (1999) Counted data control charts sensitive to sudden increases of the summary statistic REVSTAT (Statistical Review): 1, 25-45.

• Fountain, John; Gomes, Gracinda M. S.; Gould, Victoria (1999) Enlargements, semiabundancy and unipotent monoids Comm. Algebra: 27 (2), 595-614.

• Alves, Carlos J. S.; Ha Duong, Tuong (1999) Inverse Scattering for Elastic Plane Cracks Inverse Problems: 15(1), 91-97.

• Ferreira, Helena (1999) Limit distributions for point processes of exceedances of random levels Test: 8(1), 191-200.

• Alves, Carlos J. S. (1999) Numerical Simulations on Resonance Poles - the Trapping Case of Two Plane Cracks Journal of Computational and Applied Mathematics: 111(1-2), 267-279.

• Bentz, Wolfram; Bulman-Fleming, Sydney (1999) On Equalizer-flat Acts Semigroup Forum: 58, 5 – 16.

• Gomes, Gracinda M. S.; Gould, Victoria (1999) Proper weakly left ample semigroups Internat. J. Algebra Comput.: 9 (6), 721-739.

• Ramalhoto, M.F.; Morais, M. C.  (1999) Shewhart control charts for the scale parameter of a Weibull control variable with fixed and variable sampling intervals Journal of Applied Statistics: 26, 129-160.

• Bentz, Wolfram (1999) Topological Implications in Varieties Algebra Universalis: 42, 9 – 16.

• Kulikov, Gennady Yu (1998) A method of error analysis for Runge-Kutta methods Computational Mathematics and Mathematical Physics: 38(10), 1580-1582.

• Kulikov, Gennady Yu (1998) Asymptotic error estimates for the method of simple iterations and for the modified and generalized Newton methods Mathematical Notes: 63(3-4), 494-502.

• Galvão, M. Luísa; Smith, Patrick F. (1998) Chain Conditions in Modular Lattices Colloquium Mathematicum: 76 (1), 85-98.

• Bordalo, Gabriela Hauser; Rodrigues, Elias (1998) Complements in modular and semimodular lattices Portugaliae Math.: 55 (3), 373-380.

• Ferreira, Helena (1998) Doubly stochastic compound Poisson processes in extreme value theory Portugaliae Mathematica: 55(4), 465-474.

• Ramalhoto, M.F.; Morais, M. C.  (1998) EWMA control charts for the scale parameter of a Weibull control variable with fixed and variable sampling intervals Economic Quality Control: 13, 23–46.

• Santa-Clara, Catarina (1998) Extending modules with injective or semisimple summands J. Pure Applied Algebra: 127, 193-203.

• Berman, Joel; Bordalo, Gabriela Hauser (1998) Finite distributive lattices and doubly irreducible elements Discrete Mathematics: 178, 237-243.

• Gomes, Gracinda M. S.; Szendrei, Mária B. (1998) Idempotent pure extensions of inverse semigroups via quivers J. Pure Applied Algebra: 127, 15-38.

• Antunes, Nelson; Rocha, R.; Pinto, P.; Pacheco, António (1998) Impact of next-generation wireless networks requirements on teletraffic modeling Interoperable Communication Network: 1(2-4), 706-715.

• Morais, M. C. ; Natário, I. (1998) Improving an upper one-sided c-chart Communications in Statistics - Theory and Methods: 27(2), 353–364.

• Kulikov, Gennady Yu (1998) Numerical solution of the Cauchy problem for a system of differential-algebraic equations with the use of implicit Runge-Kutta methods with a nontrivial predictor Computational Mathematics and Mathematical Physics: 38(1), 64-80.

• Santa-Clara, Catarina; Silva, F. C. (1998) On infinite Goldie dimension J. Algebra: 205, 617-625.

• Gouveia, M. J.; (previously Saramago, M. J.) (1998) Optimal natural dualities for some quasivarieties of distributive double p-algebras Acta Math. Univ. Comenianae: 67, 249-272.

• Kulikov, Gennady Yu (1998) Revision of the theory of symmetric one-step methods for ordinary differential equations Journal of Applied Mathematics and Computing: 5(3), 579-600.

• Gomes, Gracinda M. S.; Howie, John M. (1998) Semigroups with zero whose idempotents form a subsemigroup Proc. Royal Soc. Edinburgh: 128A, 265-281.

• Morais, M. C. ; Pacheco, António (1998) Two stochastic properties of one-sided exponentially weighted moving average control charts Communications in Statistics - Simulation and Computation: 27(4), 937–952.