Institution: | 1.Nonlinear Physics and Complex Systems Group, Department of Physics, The Higher Teacher’s Training College, University of Yaoundé 1, P.O. Box 47, Yaoundé, Cameroon ;2.Pure Physics Laboratory, Group of Nonlinear Physics and Complex Systems, Department of Physics, Faculty of science, University of Douala, P.O. Box 24157, Douala, Cameroon ; |