Dr. Saurabh Sharma, Dr. Neeharika Arora, Dr. Sayeddurrehman, and Dr. Jyoti Pathania, “EFFECT OF ADDING NALBUPHINE VS FENTANYL ON BLOCK CHARACTERISTICS OF 0.75% HYPERBARIC ROPIVACAINE IN LOWER LIMB SURGERY: A RANDOMIZED CONTROL TRIAL”, J Popl Ther Clin Pharmacol, vol. 32, no. 2, pp. 1145–1151, Mar. 2025, doi: 10.53555/6tzg1980.