Source: https://www.researchgate.net/profile/Jean-Claude-Guinan-2/publication/238767283_BILAN_CARIEUX_DES_ENFANTS_SCOLARISES_AGES_DE_12_ANS_EN_1996_EN_COTE_D'IVOIRE/links/5ddfe6d24585159aa45176e4/BILAN-CARIEUX-DES-ENFANTS-SCOLARISES-AGES-DE-12-ANS-EN-1996-EN-COTE-DIVOIRE.pdf