“Comparison of Hyperbaric Bupivacaine Alone Versus Bupivacaine With Fentanyl for Spinal Anesthesia in Lower Abdominal and Lower Limb Surgery”. The Planet 10, no. 3 (October 3, 2026): 662–666. Accessed October 4, 2026. https://bdjournals.org/planet/article/view/1522.