U. Sharma, K. S. Thakur, P. Goyal, and B. Choudhary, “To Compare Isobaric 0.5% Levobupivacaine With Isobaric 0.5% Ropivacaine In Brachial Plexus Block For Elective Upper Limb Surgery”, AAN, vol. 5, no. 1, pp. 171-173, Jul. 2020.