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First Author:
 
Bruno Milani
Federal University of Santa Maria
brunoprofess@gmail.com
 
Rua Visconde de Pelotas 1700, ap 316 Bairro N. Srª de Fátima
Santa Maria, 97015-140, Brazil
 
55 55 9975 5850(Phone)
55 55 9975 5850(Fax)

Second Author:

Paulo Sérgio Ceretta
Federal University of Santa Maria
milani_bruno@yahoo.com.br