Khan, Yasser Saeed, et al. “AN EXPERIENCE OF BRONCHOTOMY AND RESECTIONAL PROCEDURES AFTER FAILED BRONCHOSCOPIC FOERIGN BODY RETRIEVAL”. Journal of Ayub Medical College Abbottabad, vol. 27, no. 2, June 2015, pp. 323-5, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/26.