Abstract
CM-UTAD (Centro de Matematica da Universidade de Tras-os-Montes e Alto Douro), funded by the Portuguese Government through the FCT - Fundacao para a Ciencia e a Tecnologia under the project PEst-OE/MAT/UI4080/2014. The work of J. Petronilho was supported by the CMUC (Centro de Matematica da Universidade de Coimbra), funded by the European Regional Development Fund through the program COMPETE and by the Portuguese Government through the FCT - Fundacao para a Ciencia e a Tecnologia under the project PEst-C/MAT/UI0324/2011. J. Petronilho was also supported by Direccion General de Investigacion, Desarrollo e Innovacion, Ministerio de Economia y Competitividad of Spain, under grant MTM2012-36732-C03-02.
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