PRAVEEN KUMAR, BHUPENDRA SINGH, HARSHA D and VIKRAM SINGH RATHORE 2024. A COMPARISON OF EFFICACY OF EPIDURAL BUTORPHANOL AND FENTANYL FOR POST-OPERATIVE PAIN ANALGESIA IN LOWER ABDOMINAL AND LOWER LIMB SURGERIES UNDER EPIDURAL ANESTHESIA: A PROSPECTIVE RANDOMIZED DOUBLE-BLINDED STUDY. Asian Journal of Pharmaceutical and Clinical Research. 17, 10 (Oct. 2024), 38–42. DOI:https://doi.org/10.22159/ajpcr.2024v17i10.52123.