1. Higher Teacher Training College, Yaoundé, Cameroon
2. Laboratory of Mechanics, Materials and structures, The University of Douala, Douala, Cameroon
3. Laboratory of Civil Engineering and Mechanics, National Advanced School of Engineering, The University of Yaoundé I, Yaoundé, Cameroon
4. The Institute of Wood Technology at Mbalmayo, The University of Yaounde I, Mbalmayo, Cameroon
5. National Committee for Developpment Technologies, the Ministry of Scientific Research and Innovation, Yaoundé, Cameroon