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First Author:
 
Fernanda G Barba
Universidade Federal de Santa Maria
fernandadebarba@yahoo.com.br
 
Rua Duque de Caxias, 1451/401
Santa Maria, 97015-190, Brazil
 
+55 55 32209258(Phone)
+55 55 32209258(Fax)

Second Author:

Paulo S Ceretta
Universidade Federal de Santa Maria
ceretta@smail.ufsm.br
 
Santa Maria, 97015-372, Brazil
 
+55 55 32209258(Phone)