This work was partially supported by the Chilean government under the projectgrant FONDECYT 1160868 and by Portuguese funds through FCT, Fundacao para a Ciencia e a Tecnologia, withinthe Projects UID/MAT/00013/2013… Click to show full abstract
This work was partially supported by the Chilean government under the projectgrant FONDECYT 1160868 and by Portuguese funds through FCT, Fundacao para a Ciencia e a Tecnologia, withinthe Projects UID/MAT/00013/2013 (CMAT/Universidade do Minho) and UID/MAT/00006/2013 (CEA/UL) and by theresearch center CEMAT (Instituto Superior Tecnico, Universidade de Lisboa) through the Project UID/Multi/04621/2013
               
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