D. A. MANOJ, D. R. VIKNES, D. YACHENDRA, and D. L. N, “COMPARISON OF EPIDURAL TRAMADOL AND EPIDURAL FENTANYL FOR POSTOPERATIVE PAIN AND HEMODYNAMIC CHANGES: A RANDOMIZED CONTROLLED TRIAL”, TPM, vol. 32, no. S3(2025) : Posted 07 July, pp. 1566–1572, Jul. 2025.