1. Department of Mechanical Engineering, ENSPY, University of Yaoundé I, P.O. Box 8390, Yaoundé, Cameroon
2. Department of Mechanical Engineering, ENSET, University of Douala, P.O. Box: 1872, Douala, Cameroon
3. Mechanic Laboratory (LM), Doctoral Training Unit in Engineering Sciences (UFD-SI), University of Douala, P.O. Box: 1872, Douala, Cameroon
4. Laboratory of valorization of forest resource and wood, ENSET, University of Douala, P.O. Box: 1872, Douala, Cameroon
5. Mechanics and Adapted Materials Laboratory (LAMMA), ENSET–University of Douala, Cameroon
6. Laboratory of Inorganic Chemistry, FS, University of Yaoundé 1, P.O. Box: 812 Yaoundé, Cameroon