Khassaf, W. H. ., Niamah, A. K. ., & Al-Manhel, A. J. A. . (2019). Study of the Optimal Conditions of Levan Production from a Local Isolate of Bacillus subtilis subsp. subtilis w36. Basrah Journal of Agricultural Sciences, 32(2), 213–222. https://doi.org/10.37077/25200860.2019.211