| Affiliation: | 1. Higher Teachers’ Training College of Maroua, The University of Maroua, P.O. Box. 46, Cameroon;2. Department of Physics, Faculty of Science, The University of Maroua, P.O. Box 46, Cameroon;3. Department of Physics, Faculty of Science, The University of Ngaoundere, P.O. Box 454, Cameroon;4. Department of Physics, Faculty of Science, The University of Yaounde I, P.O. Box 812, Cameroon;1. Shanghai Key Laboratory of Trustworthy Computing, East China Normal University, Shanghai 200062, China;2. MOE International Joint Lab of Trustworthy Software, East China Normal University, Shanghai 200062, China |
