Repositorio Institucional de la Universidad de Oviedo

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This research was done within the grants MAT2012-37584 and P11-RNM-7550, funded by the Spanish Government, European Commission and the Junta de Andalucıa. ER-A acknowledges the receipt of a Ramón y Cajal grant from the Spanish Government (Ministerio de Economia y Competitividad) and funding from the research group RNM-179 of the Junta de Andalucía.