Balasubramanian Seeralan, Kavin Kumar Shanmugam, and Siva Shanmugam. “Difficult Airway Assessment Score for Prediction of Difficult Intubation in Pre-Operative Assessment”. International Journal of Health and Clinical Research, vol. 4, no. 18, Oct. 2021, pp. 143-9, https://ijhcr.com/index.php/ijhcr/article/view/2938.