Fatima, N., M. Sirajuddin, S. Raheem, A. A. Ebrahim, and S. R. Fatima. “Low Dose of Intravenous Ketamine for Prevention of Hypotension After Subarachnoid Block”. International Journal of Health and Clinical Research, vol. 4, no. 3, Feb. 2021, pp. 11-17, https://ijhcr.com/index.php/ijhcr/article/view/860.