Limbu, P. M., S. Khatiwada, B. P. Sah, S. N. Singh, K. Pokharel, and R. Maharjan. “Intrathecal Magnesium Sulfate As Analgesic and Anaesthetic Adjunct to Bupivacaine in Patients Undergoing Lower Extremity Orthopaedic Surgery”. Journal of Society of Anesthesiologists of Nepal, vol. 4, no. 2, Aug. 2018, pp. 74-80, http://www.jsan.org.np/jsan/index.php/jsan/article/view/224.