Sumit Das, Pritam Yadav, Sanjay Johar, Naveen Malhotra, Irin Saha, and Ritu Rathee, “A study to evaluate the efficacy of instillation of ropivacaine with fentanyl, dexmedetomidine, or morphine through surgical drain for post-operative analgesia in patients undergoing modified radical mastectomy”, Asian J Med Sci, vol. 14, no. 7, pp. 69–75, Jul. 2023.