Mudgal, N., and M. Saini. “To Compare Isobaric 0.5% Levobupivacaine With Isobaric 0.5% Ropivacaine in Brachial Plexus Block For Elective Upper Limb Surgery.”. Academia Anesthesiologica International, Vol. 4, no. 2, May 2019, pp. 58-60, doi:10.21276/aan.2019.4.2.15.