1. Laboratoire de Chimie Physique et Analytique Appliquée
2. Faculté des Sciences
3. Université de Yaoundé I
4. Yaoundé
5. Cameroon
6. Department of Chemistry
7. University of Pretoria
8. Hatfield
9. South Africa
10. Centre for Nanostructures and Advanced Materials (CeNAM)
11. Chemicals Cluster
12. Council for Scientific and Industrial Research (CSIR)
13. Brummeria
14. Maseno University
15. Maseno
16. Kenya
17. School of Chemistry
18. University of Nottingham
19. University Park
20. Nottingham
21. UK