Repositorio Institucional de la Universidad de Oviedo

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Financial support by the Access to Research Infrastructures activityin the 7th Framework Program of the EU (SFERA 2 Grant Agreement n.312643) is gratefully acknowledged and the use of the facilities and its researchers/technology experts. This research was supported by the Ministerio de Educación,Cultura y Deportes of Spain via an FPU (Formación del Profesorado Universitario) grant to one of the authors: Daniel Fernández González(grant number FPU014/02436)