1. Institute of Science and Technology, Federal University of São Paulo, São José dos Campos 12247-014, Brazil
2. Department of Applied Mathematics, Rio de Janeiro State University, Rio de Janeiro 20550-900, Brazil
3. Environmental Science and Technology Postgraduate Program, Federal University of Fronteira Sul, Erechim 99700-970, Brazil
4. Polytechnic Institute of Leiria, Leiria 2411-901, Portugal