Mishra, S., P. Srivastava, S. Rath, A. Mahdi, S. Agarwal, and V. Lakshmi. “Synthesis and Biological Evaluation of Sulphonyl Derivatives of Naturally Occurring Chromone Alkaloid of Rohitukine As Anticancer Agents”. Journal of Basic Pharmacology and Toxicology, Vol. 2, no. 1, Jan. 2018, pp. 1-7, http://scigreen.com/index.php/JBPT/article/view/42.