1. Computer Science Department, University of Brasília, Brazil and Computer Science Department, Instituto Brasileiro de Ensino, Desenvolvimento e Pesquisa de Brasília, Brazil
2. Computer Science Department, University of Brasília, Brazil
3. Ingram School of Engineering, Texas State University, United States and Electrical Engineering, University of Brasilia, Brazil
4. Computer Science Department, Texas State University, United States and Electrical Engineering, University of Brasilia, Brazil