Nakkaew, S., and J. Warapasakul. “Comparison of number of patients with Bispectral index values < 60 during neonatal delivery between 1% and 1.2% Sevoflurane in 50% N2O in patients undergoing cesarean section under general anesthesia”. Thai Journal of Anesthesiology, vol. 40, no. 3, June 2016, pp. 181-92, https://he02.tci-thaijo.org/index.php/anesthai/article/view/58895.