Parvin M, Ara A, Nurjahan K, Roy L, Lailatunnessa -. Comparison of efficacy between intrathecal nalbuphine and fentanyl as adjuvant to hyperbaric bupivacaine for perianal surgery. Bangladesh med. j. Khulna [Internet]. 2021 Jul. 18 [cited 2024 Sep. 18];53(1-2):27-30. Available from: https://banglajol.info/index.php/BMJK/article/view/54886