Source: https://www.researchgate.net/profile/Nouhoun_Belko/publication/281684774_Amelioration_de_l'adaptation_a_la_secheresse_chez_le_niebe_Vigna_unguiculata_L_Walpers/links/55f43ec708ae1d980394bb2d/Amelioration-de-ladaptation-a-la-secheresse-chez-le-niebe-Vigna-unguiculata-L-Walpers.pdf