K., S., R. R. V. Rajan, N. Shah, and N. Bhat. “Rigid Bronchoscopy for Foreign Body Removal: An Overview”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 3, no. 4, Sept. 2017, pp. 936-8, doi:10.18203/issn.2454-5929.ijohns20173170.