Repositorio Institucional de la Universidad de Oviedo

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This research has been supported by the Spanish Ministry of Science and Innovation (MICINN) and the Spanish Higher Council for Scientific Research (CSIC) under the Project MAT2012-38645. Likewise, the work was partially carried out within the framework of the Regulation of the Government of the Russian Federation dated 9 April 2010 No. 220 (Agreement No. 14.B25.31.0012 dated 26 June 2013). Finally, Lidia Goyos-Ball acknowledges financial support from the JAE-PREDOC program (CSIC).