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First Author:
 
Marcelo Brutti Righi
Federal University of Santa Maria
marcelobrutti@hotmail.com
 
 
 
 

Second Author:

Kelmara Mendes Vieira
Federal University of Santa Maria
kelmara@terra.com.br
 
 
 
 

Third Author:

Daniel Arruda Coronel
Federal University of Santa Maria
daniel.coronel@ufv.br
 
 
 
 

Fourth Author:

Reisoli Bender Filho
Federal University of Santa Maria
reisolibender@yahoo.com.br
 
 
 
 

Five Author:

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