1. Foreign bodies in the trachea and bronchi;Roland,1995
2. Tracheobronchial foreign bodies: experience at Red Cross Children’s Hospital, 1985–1990;Linegar;S. Afr. Med. J.,1992
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4. Fracture of tracheostomy tube: pathogenesis and prevention;Okafor;J. Laryngol. Otol.,1983
5. Broken tracheostomy tube as a foreign body;Bassoe;Lancet,1960