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First Author:
 
Marcelo Brutti Righi
Universidade Federal de Santa Maria
marcelobrutti@hotmail.com
 
Santa Maria, 97015-372, Brazil
 
+55 55 32209258(Phone)
+55 55 32209258(Fax)

Second Author:

Paulo Sérgio Ceretta
Universidade Federal de Santa Maria
ceretta10@gmail.com