Repositorio Institucional de la Universidad de Oviedo

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20130842

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The research in this paper has been partially supported by the Spanish Ministry of Science and Innovation Grants MTM2009-09440-C02-01 and MTM2009-09440-C02-02, the COST Action IC0702 (especially through the Short Terms Scientific Missions spent by Blanco, Colubi, García-Bárzana, González-Rodríguez, Ramos, de la Rosa de Sáa and Sinova), the FPU Grant AP2009-1197 and the Ayuda de Investigación 2011 de la Fundación Banco Herrero (Sinova), the FPI Grant BES2010-032172 (García-Bárzana) and the Contract CP-PA-11-SMIRE from the Principality of Asturias-Universidad de Oviedo (de la Rosa de Sáa). Their financial support is gratefully acknowledged.