Nakkaew, S., and N. Chaokasemsuntorn. “Bispectral index values in patients undergoing cesarean section under general anesthesia at Nopparatrajathanee Hospital”. Thai Journal of Anesthesiology, vol. 40, no. 1, June 2016, pp. 18-27, https://he02.tci-thaijo.org/index.php/anesthai/article/view/59436.