1. Department of Physics, Faculty of Science, The University of Maroua, Maroua, Cameroon
2. Centre d'Excellence en Technologies de l'Information et de la Communication (CETIC), The University of Yaounde I, Yaounde, Cameroon
3. Higher Teachers' Training College of Maroua, The University of Maroua, Maroua, Cameroon
4. Department of Physics, Faculty of Science, The University of Ngaoundere, Ngaoundere, Cameroon
5. Department of Physics, Faculty of Science, The University of Yaounde I, Yaounde, Cameroon
6. National Advanced School of Engineering, The University of Yaounde I, Yaounde, Cameroon