Repositorio Institucional de la Universidad de Oviedo

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P.R.G. would like to acknowledge the postdoctoral fellowship from the“Secretaria de Estado de Universidades e Investigacion”of the Spanish Ministry of Education and Science. This project was funded by French National Research Agency (ANReJeune Chercheur program) in the framework of the MINAMETA project (JCJC2006-0044). T. Stoichev is grateful to the Foundation for Science and Technology for fellowship SFRH/BPD/88675/2012,co-financed by Programa Operacional Potencial Humano (POPH)/Fundo Social Europeu (FSE)