Surve, P., N. Dsouza, R. Patil, D. N. Agrawal, and A. . “Effect of Low Dose Intrathecal Clonidine As an Adjuvant to Hyperbaric Bupivacaine on Postoperative Analgesia in Patients Undergoing Elective Infra Umbilical Surgeries”. Anaesthesia, Pain & Intensive Care, Vol. 22, no. 1, Jan. 2019, pp. 26-31, https://mail.apicareonline.com/index.php/APIC/article/view/16.