Repositorio Institucional de la Universidad de Oviedo

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The first and fifth author acknowledge the partial support of the Research Project TIN2014- 59543-P (Spain) of the Spanish Ministry of Economy and Competitiveness. The second author acknowledges the partial support of the Research Projects MTM2012-37894-C02-02, TIN2013- 40765-P and MTM2015-63608-P (Spain) of the Spanish Ministry of Economy and Competi- tiveness. The third author acknowledges the support of Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic for the Structural Funds of EU, under project ITMS: 26220120007