Source: https://www.researchgate.net/profile/Mohamed_Hafidi2/publication/269336829_Le_potentiel_mycorhizogene_des_sols_urbains_en_zones_semi-arides_et_la_tolerance_du_Palmier_dattier_Phoenix_dactylifera_L_au_deficit_hydrique_The_mycorrhizal_potential_of_urban_soils_in_semi-arid_zone/links/554353ed0cf234bdb21a43df.pdf