1. Department of Chemistry, Faculty of Science, The University of Bamenda, P. O. Box 39, Bambili, Bamenda, Cameroon
2. Department of Fundamental and Cross-cutting Sciences, National Advanced School of Public Works, P. O. Box 510, Yaounde, Cameroon, ghogsjuju@hotmail.com
3. Department of Chemistry, Ecole Normale Superieure, Université de Bertoua, P. O. Box 652, Bertoua, Cameroon
4. Department of Chemistry, Research Unit of Noxious Chemistry and Environmental Engineering, Faculty of Science, University of Dschang, P. O. Box 67, Dschang, Cameroon