Halvadia, S. H., H. B. Halvadia, R. M. Joshi, and D. P. Upadhyaya. “Low Dose Bupivacaine - Fentanyl Vs. Conventional Dose Of Bupivacaine In Spinal Anesthesia For Orthopaedic Procedures In Elderly Patients: Low Dose Bupivacaine - Fentanyl Vs. Conventional Dose Of Bupivacaine”. National Journal of Integrated Research in Medicine, vol. 4, no. 1, Feb. 2013, pp. 50-56, doi:10.70284/njirm.v4i1.2127.