“Effects of Addition of Different Doses of Clonidine to Intrathecal Ropivacaine in Lower Limb and Subumbilical Surgeries”. International Journal of Biomedical Research 7, no. 9 (September 30, 2016): 689–694. Accessed April 2, 2026. https://ssjournals.co.in/index.php/ijbr/article/view/3624.