K. H. Sulaiman, F. N. Al-Barakah, A. M. Assafed, and B. A. M. Dar, “Isolation and identification of Azospirillum and Azotobacter species from Acacia spp. at Riyadh, Saudi Arabia”, Bangladesh J. Bot., vol. 48, no. 2, pp. 239–251, Jun. 2019.