Department of Physics, Sciences and Technics Faculty, University Cheikh Anta Diop UCAD, Dakar, Senegal
Department of Physics, Sciences and Technics Faculty, University Cheikh Anta Diop UCAD, Dakar, Senegal
Copyright © 2016 Bassirou Lô, Serigne Bira Gueye 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.