1. Department of Physics, Faculty of Science, University of Maroua, Maroua, Cameroon
2. Department of Marine Engineering, Limbe Nautical Arts and Fisheries Institute, Limbe, Cameroon
3. Department of Basic Science, Faculty of Mines and Petroleum Industries, University of Maroua, Kaélé, Cameroon
4. Department of Physics, Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon
5. Department of Computer Engineering, Biruni University, Istanbul, Turkey
6. Science Faculty, Department of Mathematics, Firat University, Elazig, Turkey
7. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
8. Laboratory of Mechanics, Materials and Structures, Department of Physics, Faculty of Science, University of Yaounde I, Cameroon