1. Higher Teachers' Training College of Maroua; The University of Maroua; PO Box 55 Cameroon
2. Centre d'Excellence en Technologie de l'Information et de la Communication (CETIC); The University of Yaounde I; PO Box 812 Cameroon
3. Department of Physics, Faculty of Sciences; The University of Maroua; PO Box 814 Cameroon
4. Department of Physics, Faculty of Sciences; The University of Yaounde I; PO Box 812 Cameroon