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First Author:
 
Bruno Milani
Santa Maria Federal University
milani_bruno@yahoo.com.br
 
Rua Visconde de Pelotas 1700, ap 316 Bairro Nª Srª de Fátima
Santa Maria, 97015-140, Brazil
 
+55 55 9975 5850(Phone)
+55 55 9975 5850(Fax)

Second Author:

Paulo Sergio Ceretta
Santa Maria Federal University
ceretta10@gmail.com