1. Center for Nonlinear Systems, Chennai Institute of Technology, Chennai-600069, Tamilnadu, India
2. Department of Basic Sciences, School of Geology and Mining Engineering, University of Ngaoundere, P. O. BOX 115, Meiganga, Cameroon
3. Information Technology College, Imam Ja’afar Al-Sadiq University, Baghdad 10001, Iraq
4. Department of Hydraulics and Water Management, National Advanced School of Engineering, University of Maroua, P. O. Box 46, Maroua, Cameroon
5. Research Unit of Condensed Matter of Electronics and Signal Processing Department of Physics, Faculty of Sciences, University of Dschang, P. O. Box 67, Dschang, Cameroon