Repositorio Institucional de la Universidad de Oviedo

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We acknowledge financial support from CONACyT (grant 253776 as well as scholarships 273438, 308773 and 381483) and the Spanish government (project CTQ-2015-65790-P). We are also thankful for computer time DGTIC/(grants SC16-1-IG-99 and SC16-1-IR-109) along with technical support from Magdalena Aguilar Araiza, Gladys Cortés Romero, David Vázquez Cuevas and Víctor Duarte Alaniz.