1. Research Unit Condensed Matter, Electronics and Signal Processing, University of Dschang, P.O. Box 67, Dschang, Cameroon
2. Faculty of Computer Science, University of Namur, Rue Gandgagnage 21, 5000 Namur, Belgium
3. MoCLiS Research Group, Dschang, Cameroon
4. Center for Interdisciplinary Research on Complex Systems, University of Sao Paulo, Av. Arlindo Bettio 1000, 03828-000 São Paulo, Brazil
5. Department of Physics–FFCLRP, University of São Paulo, Ribeirao Preto, SP 14040-901, Brazil
6. L2MSP, University of Dschang, P.O. Box 67, Dschang, Cameroon
7. Instituto de Física Teórica, São Paulo State University (UNESP), Rua Dr. Bento Teobaldo Ferraz 271, Bloco II, Barra Funda, 01140-070 São Paulo, Brazil