Repositorio Institucional de la Universidad de Oviedo

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The authors gratefully acknowledge financial support from DGAPA/UNAM (project PAPIIT IN209715) and the Spanish goverment (grant CTQ2012-31174) and computer time from DGTIC/ UNAM (grant SC16-1-IG-99) and the Guanajuato National Laboratory (CONACyT Mexico grant 123732). T. R.-R., E. R. M. and J. M. G. V. are also thankful to CONACyT/México for financial support (grant 253776), MSc and PhD scholarships (numbers 308773 and 381483) respectively. T. R.-R. expresses his gratitude to Magdalena Aguilar Araiza, Gladys Cortés Romero and David Vázquez Cuevas for technical support.