Varshney, Rohit K., Mukesh K. Prasad, and Megha Garg. “Comparison of Nitroglycerin Versus Lignocaine Spray to Attenuate Haemodynamic Changes in Elective Surgical Patients Undergoing Direct Laryngoscopy and Endotracheal Intubation: A Prospective Randomised Study”. Sultan Qaboos University Medical Journal 19, no. 4 (December 22, 2019): e316–323. Accessed May 3, 2024. https://journals.squ.edu.om/index.php/squmj/article/view/3386.