1. Higher Teacher Training College – Department of Mathematics, University of Yaoundé I, Yaoundé, Cameroon
2. Deustotech Laboratory Chair of Computational Mathematics, University of Deusto, Bilbao, Spain
3. AIDEPY Association des Ingénieurs Diplomés de l'Ecole Polytechnique de Yaoundé, Yaoundé, Cameroon
4. Department of Mathematics, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon