“Study of Effect of Fentanyl and Tramadol Added to Low Dose Bupivacaine in Subarachnoid Block for Caesarean Section – a Comparative Study”. Journal of the Bangladesh Society of Anaesthesiologists 25, no. 2 (August 3, 2014): 41–47. Accessed June 30, 2026. https://banglajol.info/index.php/JBSA/article/view/60983.