Repositorio Institucional de la Universidad de Oviedo

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This work was financially supported by the National Natural Science Foundation of China under [grant numbers. 51272003 and 51472004], the Program of the Education Department of Anhui Province [grant numbers. KJ2012A027 and KJ2013B057], and from the Research Fund for the Doctoral Program of Higher Education of China under [project number 20123401110008], and from the Spanish Ministry of Education and Science under [project number MAT2009-14534-C03-03].