C. I. Ahmed, F. Akhtar, and M. Zameer, “MANAGEMENT OF DIFFICULT AIRWAY BY RETROGRADE ENDOTRACHEAL INTUBATION IN CARDIAC SURGERY PATIENT: Difficult Airway & Endotracheal Intubation”, Pak Armed Forces Med J, vol. 60, no. 3, pp. 498–9, Sep. 2010, Accessed: Aug. 29, 2025. [Online]. Available: https://pafmj.org/PAFMJ/article/view/1869