Verma, Lokesh, Hemant Borana, Govind Desai, and Sanidhaya Tak. “Saber Sheath Trachea in Chronic Obstructive Pulmonary Disease Patients”. International Journal of Advances in Medicine 6, no. 3 (May 24, 2019): 989–990. Accessed January 2, 2026. https://www.ijmedicine.com/index.php/ijam/article/view/1644.