Adham, N. Z., E. M. Ahmed, and H. A. E. Refai. “Metabolic Inhibitors As Stimulating Factors for Citric Acid Production”. Biological Sciences - PJSIR, vol. 51, no. 5, Jan. 2008, pp. 245-9, https://v2.pjsir.org/index.php/biological-sciences/article/view/680.