Repositorio Institucional de la Universidad de Oviedo

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We thank Bogdan Bułka for helpful advices. This work has been supported by the National Science Centre under the contract DEC-2012/07/B/ST3/03412. Our computations were performed at the Poznan´’s Supercomputing and Networking Center. V. M. G.-S. thanks the Spanish Ministerio de Economía, Industria y Competitividad for funding through the project FIS2015-63918-R.