1. School of Exact Sciences and Computing; Pontifical Catholic University of Goiás; 74605-010 Goiânia, Goiás Brazil
2. Laboratório de Modelagem Matemática de Biosistemas; Universidade Estadual Paulista UNESP; 11330-900 São Vicente, SP Brazil
3. Condensed Matter Physics Department; Institute of Physics, “Gleb Wataghin” State University of Campinas-Unicamp; 13083-859 Campinas, SP Brazil