Repositorio Institucional de la Universidad de Oviedo

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The first author was partially funded by Fundacao Calouste Gulbenkian, by the European Regional Development Fund through the program COMPETE and by the Portuguese Government through FCT under the projects PEst-C/MAT/UI0144/2013 and PTDC/MAT/120346/2010. The second and third authors were partially supported by MEC grant MTM2011-22956 and MINECO-15-MTM2014-56953-P. The third author was also supported by the Foundation for the Promotion of Applied Scientific Research and Technology in Asturias (BP12-123) and by CMUP (UID/MAT/00144/2013), which is funded by FCT with national (MEC) and European structural funds through the programs FEDER, under the partnership agreement PT2020.