A. S. Patel and A. V. Patel, “Comparative Analysis of Efficacy and Haemodynamic Response between Intrathecal Hyperbaric 0.5% Bupivacaine with Isobaric 0.75% Ropivacaine Utilizing Fentanyl as Adjuvant in Subjects Undergoing Umbilical Surgeries”, AAN, vol. 7, no. 1, pp. 8-10, Jun. 2022.