1. Computational Dynamics Group, Departamento de Matemática Aplicada, GME and IUMA, Universidad de Zaragoza, E-50009 Zaragoza, Spain
2. Computational Dynamics Group, GME, Universidad de Zaragoza, E-50009 Zaragoza, Spain
3. Neuroscience Institute and Department of Mathematics and Statistics, Georgia State University, Atlanta, Georgia 30078, USA
4. Department of Computational Mathematics and Cybernetics, Lobachevsky State University of Nizhni Novgorod, 603950 Nizhni Novgorod, Russia