1. Foreign bodies in thp gut and upper airway;Roseman,1978
2. Esophageal perforation following meat impaction and papain ingestion;Holsinger;JAMA,1968
3. Removal of foreign bodies from the upper intestinal tract with fiberoptic instruments;Waye;Am J Gastroenterol,1976
4. Polypectomy snare extraction of foreign bodies from the esophagus;Deluca;Am J Gastroenterol,1976
5. Fiberendoscopic removal of large foreign bodies from the stomach;Dunkerley;Gastrointest Endosc,1975