Source: https://www.researchgate.net/profile/Richard-Marcoux/publication/32972846_Frequentation_scolaire_et_structure_demographique_des_menages_en_milieu_urbain_au_Mali/links/552bab9b0cf2e089a3aa5680/Frequentation-scolaire-et-structure-demographique-des-menages-en-milieu-urbain-au-Mali.pdf