Repositorio Institucional de la Universidad de Oviedo

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The authors want to thank to the Spanish Ministry of Education, Culture and Sport for funding (ref: PR2015-00458) the research stay of Antolin Hernández Battez at Universidade do Porto (Portugal) within the programme ‘Salvador de Madariaga’. They also thank to the Spanish Ministry of Economy and Competitiveness and the Foundation for the Promotion in Asturias of Applied Scientific Research and Technology (FICYT) for supporting the research projects DPI2013-48348-C2-1-R and GRUPIN14-023, respectively. The authors gratefully acknowledge the funding supported by National Funds through Fundação para a Ciência e Tecnologia (FCT), under the project EXCL-II/SEM-PRO/0103/2012; NORTE-01-0145-FEDER-000022 - SciTech – Science and Technology for Competitive and Sustainable Industries, cofinanced by Programa Operacional Regional do Norte (NORTE2020), through Fundo Europeu de Desenvolvimento Regional (FEDER) and LAETA under the project UID/EMS/50022/2013.