Turai, Ashwini, et al. “A Clinical Study to Evaluate the Effect of Intrathecal Atropine on Post Operative Nausea and Vomiting in Patients Receiving Intrathecal Morphine and Hyperbaric Bupivacaine for Spinal Anaesthesia: Prospective Randomized Trial”. Karnataka Anaesthesia Journal, vol. 17, no. 1-2, Apr. 2021, pp. 23-31, doi:10.4103/kaj/2019/v17i1-2/158352.