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First Author:
 
Luiz Carlos de S. Ribeiro
Universidade Federal de Sergipe, Sergipe, Brazil.
ribeiro.luiz84@gmail.com
 
 
 
 

Second Author:

Gervásio F. Santos
Federal University of Bahia, Brazil
gervasiofsantos@gmail.com
 
 
 
 

Third Author:

Rodrigo B. Cerqueira
Superintendence of Economic and Social Studies of Bahia (SEI), Salvador, Brazil
rbcerqueira@gmail.com
 
 
 
 

Fourth Author:

Kênia B. Souza
Federal University of Paraná, Brazil
keniadesouza@gmail.com