1. Physical and Theoretical Chemistry unit, Laboratory of applied Physical and Analytical Chemistry, Faculty of Science University of Yaoundé I Yaoundé Cameroon
2. Computational Chemistry Laboratory, Department of Chemistry, Higher Teacher Training College University of Yaoundé I Yaoundé Cameroon
3. Laboratory of Theoretical Chemistry (LCT) and Namur Institute of Structured Matter (NISM) University of Namur Namur Belgium
4. Computational Chemistry Group, Department of Chemistry, Faculty of Science University of Mauritius Réduit Mauritius
5. Centre for Natural Product Research, Department of Chemical Sciences University of Johannesburg Doornfontein South Africa