Neepa Patel, Bhumika J Chaudhari, Pratik D Patel, and Malti Pandya. “Comparison of Efficacy and Hemodynamic Stability of 0.5 % Isobaric Levobupivacaine and 0.5% Hyperbaric Bupivacaine in Old Age Patients Posted For Lower Limb Surgery under Spinal Anaesthesia”. International Journal of Pharmacy Research & Technology (IJPRT), vol. 15, no. 1, Apr. 2025, pp. 213-21, https://ijprt.org/index.php/pub/article/view/349.