Publications
On the structure of Cohen-Macaulay simplicial affine semigroups. Comm. Algebra. 1999;27:511-518.Edit
Every positive integer is the Frobenius number of a numerical semigroup with three generators. Math. Scand.. 2004;94:5-12.Edit
Presentations for subsemigroups of finitely generated commutative semigroups. Israel J. Math.. 1999;113:269-283.Edit
Every numerical semigroup is one half of a symmetric numerical semigroup. Proc. Amer. Math. Soc.. 2008;136:475-477 (electronic).Edit
On numerical semigroups with high embedding dimension. J. Algebra. 1998;203:567-578.Edit
The oversemigroups of a numerical semigroup. Semigroup Forum. 2003;67:145-158.Edit
Constructing almost symmetric numerical semigroups from irreducible numerical semigroups. Comm. Algebra. 2014;42:1362-1367.Edit
A Parallel Implementation of the Jacobi-Davidson Eigensolver for Unsymmetric Matrices. In: Palma JMLaginha, Daydé M, Marques O, Lopes JCorreia, editors. High Performance Computing for Computational Science – VECPAR 2010: 9th International conference, Berkeley, CA, USA, June 22-25, 2010, Revised Selected Papers. Vol 6449. Springer Berlin Heidelberg; 2011. 3. p. 380-393p. (Lecture Notes in Computer Science; vol 6449).Edit
Eigenvalue computations in the context of data-sparse approximations of integral operators. Journal of Computational and Applied Mathematics. 2013;237:171-181.Edit
Harnessing GPU Power from High-level Libraries: Eigenvalues of Integral Operators with SLEPc. Procedia Computer Science. 2013;18:2591-2594.Edit
Repelling dynamics near a Bykov cycle. Journal of Dynamics and Differential Equations. 2013.
Chaotic double cycling. Dyn. Syst.. 2011;26:199-233.Edit
Three Dimensional Flows: From Hyperbolicity to Quasi-Stochasticity. In: Dynamics, Games and Science. Vol Dynamics, Games and Science, . Lisbon, Portugal: Springer ; 2015. 5. p. 573-591p. Edit
Persistent switching near a heteroclinic model for the geodynamo problem. Chaos, Solitons & Fractals . 2013;47 :73-86.Edit
Numerical solution of partial differential equations with the tau method. In: First Meeting on Numerical Methods for Partial Differential Equations (Coimbra, 1995). Vol 11. Univ. Coimbra, Coimbra; 1997. 1. p. 111-121p. (Textos Mat. Sér. B; vol 11).Edit
On a heat kernel for the index Whittaker transform. Carpathian J. Math.. 2013;29:231-238.Edit
Attractors in complex networks. Chaos: An Interdisciplinary Journal of Nonlinear Science. 2017;27:103105.Edit
A tau method for nonlinear dynamical systems. Numerical Algorithms. 2013;62(4):583-600.
A convolution operator related to the generalized Mehler-Fock and Kontorovich-Lebedev transforms. Results Math.. 2013;63:511-528.Edit
A chaotic carousel: dynamics near heteroclinic networks. Bol. Soc. Port. Mat.. 2010:103-109.Edit