1. Department of Architecture and Engineering Art, Institute of Fine Arts, University of Dschang, Foumban, Cameroon
2. Geodesy Research Laboratory, National Institute of Cartography, Yaoundé, Cameroon
3. Department of Mines, Petroleum and Water Resource Exploration, National Advanced School of Mines and Petroleum Industries, University of Maroua, Maroua, Cameroon
4. Department of Civil and Industrial Engineering, University of Pisa, Pisa, Italy