Ramya DM, R Vinay, and KN Vikas. “Comparison of Low Dose Intrathecal Buprenorphine and Clonidine As an Adjuvant to Bupivacaine in Spinal Anesthesia for Post-Operative Analgesia in Lower Limb and Lower Abdominal Surgeries”. Academia Anesthesiologica International, Vol. 5, no. 2, Dec. 2020, pp. 155-61, doi:10.21276/aan.2020.5.2.32.