VINEELA KARTHIK NAGURI, RAVI BABU KOMARAM, and TAMILISETTI VIDYA SAGAR, “EFFICACY AND TOLERABILITY OF FLUPIRTINE VERSUS TRAMADOL IN THE TREATMENT OF MODERATE CHRONIC LOW BACK PAIN”, Asian J Pharm Clin Res, vol. 12, no. 4, pp. 84–87, Apr. 2019.