1. Laboratory of Civil Engineering and Mechanic, Yaoundé, Cameroun
2. ENSTIB – LERMAB, Nancy University, Epinal, France
3. Department of Physics, King Abdulaziz University, Jeddah, Saudi Arabia
4. Laboratory of Materials, Architecture and Civil Engineering, National Advanced School of Engineering, Maroua, University of Maroua, Maroua, Cameroun
5. Department of Mechanical Engineering Petroleum and Gas, Faculty of Mines and Petroleum Industries, University of Maroua, Kaélé, Cameroon