1. Laboratory of Environmental Modeling and Atmospheric Physics, Department of Physics, Faculty of Science; University of Yaounde I; Cameroon
2. Laboratory of Mechanics, Department of Physics, Faculty of Science; University of Yaounde I; Cameroon
3. International Chair in Mathematical Physics and Applications; University of Abomey-Calavi; Cotonou Benin
4. Center for Atmospheric Sciences; IIT Delhi; New Delhi India