We are indebted to the Brazilian agencies CNPq and FAPERGS for the partial support of this research project. This study was financed in part by the Coordenacao de Aperfeicoamento de… Click to show full abstract
We are indebted to the Brazilian agencies CNPq and FAPERGS for the partial support of this research project. This study was financed in part by the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior—Brasil (CAPES)—Finance Code 001. One of the authors (F.M.) acknowledges the Brazilian fellowship from CNPq. F.M. and N.E.K. acknowledge financial support by the Departamento de Educacion, Universidades e Investigacion, the University of the Basque Country UPV/EHU (Grant No. IT-756-13) and the Spanish Ministerio de Economia y Competitividad (Grants No. FIS2013-48286-C02-02-P and No. FIS2016-76471-P).
               
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