Repositorio Institucional de la Universidad de Oviedo

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The authors acknowledge funding from the Ministerio de Economía y Competitividad through the Project MAT2011-29174-C02-01, Principado de Asturias through project GRUPIN14-109 and the Czech Grant Agency Project No. P204/12/0232. The Ministry of Education of the Russian Federation supported this work by contract No. 14.577.21.0089, a unique identifier of contract RFMEFI57714X0089. L Fernández-García acknowledges CSIC JAE Predoctoral program for a PhD grant: JAEPre 091.