1 Nonlinear Dynamical Systems Group, Computational Science Research Center and Department of Mathematics and Statistics, San Diego State University, San Diego, CA 92182-7720
2 Grupo de Física No Lineal, Departamento de Física Aplicada I, EU Politécnica, Universidad de Sevilla, c/ Virgen de África s/n, 41011-Sevilla
3 Department of Physics, University of Athens, Panepistimiopolis, Zografos, Athens 15784
4 University of Massachusetts, Lederle Graduate Research Tower, Department of Mathematics and Statistics, Amherst, MA 01003
5 Grupo de Física No Lineal, Escuela Técnica Superior de Ingeniería Informática, Departamento de Física Aplicada I, Universidad de Sevilla, Avda. Reina Mercedes s/n, 41012-Sevilla