Sara H, Kaur K, Rani M, Anand L, Singh H, Malhotra K, Jakhar S. Comparison of Levobupivacaine and Levobupivacaine with Fentanyl for Infra Umbilical Surgeries Under Sub-Arachnoid Block. Arch Anesth & Crit Care. 2025;11(Supp. 1):730-735.