Pavankumar V. Solanki, Sekhar Babu Uppelli, Santhosh A. Padaki, Doddappa Anekal, Sunil B. Dahale, Saroj R. Bembalkar, and Vijayavitthal T. Mathad. 2015. “A Facile Approach for the Synthesis of Highly Pure Immunomodulator Drugs-Leflunomide and Teriflunomide: A Robust Strategy to Control Impurities”. World Journal of Pharmaceutical Sciences 3 (11):2265-72. https://wjpsonline.com/index.php/wjps/article/view/immunomodulator-leflunomide-teriflunomide-synthesis-impurities.