1. Laboratory of Forest Resources and Wood Valorization, Training Unit in Engineering Sciences, Post Graduate School of Fundamental and Applied Sciences, The University of Douala, Douala, Cameroon
2. Higher Technical Teachers’ Training College Bambili, The University of Bamenda, Bambili, Cameroon
3. Laboratory of Studies and Research on Wood Material (LERMAB), University of Lorraine, Blvd des Aiguillettes, Nancy, France
4. The University Institute of Technology, University of Douala, Douala, Cameroon
5. Laboratory of Mechanics, University of Douala, Douala, Cameroon
6. Department of Mechanical Engineering, Faculty of Engineering and Technology, University of Buea, Buea, Cameroon