This work was supported by the Fundacao para a Ciencia e Tecnologia (Portugal) through the project PTDC/MAT/118682/2010, and through Centro de Matemtica da Universidade do Minho [PEst-C/MAT/UI0013/2011, PEst-OE/MAT/UI0013/2014 to A.C.F]… Click to show full abstract
This work was supported by the Fundacao para a Ciencia e Tecnologia (Portugal) through the project PTDC/MAT/118682/2010, and through Centro de Matemtica da Universidade do Minho [PEst-C/MAT/UI0013/2011, PEst-OE/MAT/UI0013/2014 to A.C.F] and Centro de Fisica e Engenharia de Materiais Avanc¸ados [UID/CTM/04540/2013 to I.S.].
               
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