Repositorio Institucional de la Universidad de Oviedo

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E.F. and A.M.P. thank the Spanish MINECO Project CTQ2012-31174. E.M. also expresses his gratitude to Spanish MINECO Project No. CTQ2014-52525-P and to the Basque Country Consolidated Group Project No. IT588-13. T.R.R. acknowledges financial support from CONACyT/Mexico Project No. 253776 and PAPITT/UNAM Project IN209715 along with computer time from DGTIC/UNAM grant SC16-1-IG-99. I.R. and F.J.H-G. are grateful to CONACyT/Mexico for the Ph.D. scholarships 255243 and 288853. T.R.-R. is thankful to Magdalena Aguilar Araiza, Gladys Cortés Romero and David Vázquez Cuevas for technical support.