Goswami, Tanmoy Kanti, Pradip Kumar Ghoshal, Avijit Hazra, and Asish Biswas. “Efficacy and Safety of a Centrally Acting Analgesic Flupirtine in Primary Knee Osteoarthritis in Comparison to Tramadol: A Randomized Controlled Trial”. International Journal of Basic & Clinical Pharmacology 7, no. 3 (February 22, 2018): 381–385. Accessed October 23, 2025. https://www.ijbcp.com/index.php/ijbcp/article/view/2365.