Department of Mathematics, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
Department of Computer Sciences, Faculty of Science, University of Yaounde I, Yaounde, Cameroon
Copyright © 2017 Dahande Balme, Laure Pauline Fotso et al. This is
an open access article distributed under the Creative Commons Attribution
License, which permits unrestricted use, distribution, and reproduction in any
medium, provided the original work is properly cited.