Affiliation: | 1. Laboratory of Electronics, Department of Physics, Faculty of Science, University of Yaounde I, P.O. Box 812, Cameroon;2. Laboratory of Biophysics, Department of Physics, Faculty of Science, University of Yaounde I, P.O. Box 812, Cameroon;3. Le2i FRE2005, CNRS, Arts et Métiers, Univ. Bourgogne Franche-Comté, Dijon F-21000, France |