Duaa E. Mohamed, Abdel –Rahim S. Ibrahim, Souzan M. Ibrahim, and Amal M. Kabbash. “Microbial Transformation of Some Simple β-Carboline Alkaloids”. World Journal of Pharmaceutical Sciences, vol. 3, no. 7, July 2015, pp. 1307-18, https://wjpsonline.com/index.php/wjps/article/view/microbial-transformation-beta-carboline-alkaloids.