Repositorio Institucional de la Universidad de Oviedo

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This research has been partially supported by the Regional Government of Spain (PAI group SEJ-445 and Research Project PR09-FQM-5001), and by the Spanish Ministry of Science and Innovation (Research Projects ECO2011-28927 and ECO2013-47129-C4-2-R). The authors would like to thank the referees for all their comments, corrections and suggestions