Repositorio Institucional de la Universidad de Oviedo

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This work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under Projects MAT2013-47231-C2-1-P and MAT2013-48054-C2-2-R and by the Russian Ministry of Education and Science under MISIS Grant K3-2015-023. Technical and human support provided by SGIker (UPV/EHU, MICINN, GV/EJ, ERDF, and ESF) is gratefully acknowledged. The Asturias government is also acknowledged for its support of the FC-15-GRUPIN14-085 Project. VZ and AZ wish to acknowledge the support of the Basque government under the Program of Mobility of the Investigating Personnel of the Department of Education, Universities and Investigation (Grants MV-2016-1-0025 and MV-2006-1-0018).