Goalbaye, Touroumgaye, Mariama Dalanda Diallo, Guiguindibaye Madjimbe, Ali Mahamat Zougoulou, and Aliou Guisse. European Scientific Journal, ESJ 13, no. 9 (March 31, 2017): 316. Accessed February 2, 2026. https://last.eujournal.org/index.php/esj/article/view/9027.