1. Research Unit of Industrial Systems and Environmental Engineering (URISIE), UIT-FV Bandjoun, University of Dschang, P.O. Box 134, Bandjoun, Cameroon
2. Research Unit of Mechanics and Physical Systems Modelling (UR2MSP), Department of Physics, University of Dschang, P.O. Box 67, Dschang, Cameroon
3. Mechanics and Adapted Materials Laboratory (LAMMA), ENSET Douala, Douala, Cameroon