S. Khatun, A. K. Biswas, R. Karmakar, S. Dhar, and M. M. K. Parvin, “Study to assess the status of bupivacaine hydrochloride in the management of essential trigeminal neuralgia”, Bangladesh J Physiol Pharmacol, vol. 26, no. 1-2, pp. 30–33, Aug. 2014.