Source: https://www.researchgate.net/profile/Diwersy-Sascha-2/publication/266588468_LA_FRANCOPHONIE_MULTIVARIEE_OU_COMMENT_MESURER_LES_FRANCAIS_EN_AFRIQUE/links/564341d308ae451880a3292c/LA-FRANCOPHONIE-MULTIVARIEE-OU-COMMENT-MESURER-LES-FRANCAIS-EN-AFRIQUE.pdf