[5] The author C.M. Fernandes gratefully acknowledge the financial support from the program COMPETE and by national funds through FCT under the grant SFRH/BPD/43402/2008. This research was also financially supported by FEDER through COMPETE and national funds through FCT – Fundação para a Ciência e Tecnologia within CICECO project – FCOMP-01-0124-FERDER-037271 (FCT Ref. Pest-C/CTM/LA0011/2013).
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