1. Foreign bodies in the larynx, trachea, and bronchi;Orenstein,1996
2. The lungs and bronchi;Kuhn,1985
3. Foreign bodies;Pons,1998
4. Endoscopy: Bronchoscopy and esophagoscopy;Boyd,1995
5. Radiologic diagnosis of aspirated foreign bodies in children: Review of 343 cases;Mu;J Laryngol Otol,1990