Prudhvi, G. S. S. R., N. S. S. N. Shyam, and A. Acharya. “Evaluation of the Efficacy of 150 Micrograms of Intrathecal Morphine With Bupivacaine Compared to 250 Micrograms for Postoperative Analgesia Following Abdominal Hysterectomy: A Double Blinded Randomized Control Study”. International Journal of Clinical Trials, vol. 6, no. 1, Jan. 2019, pp. 17-22, doi:10.18203/2349-3259.ijct20190257.