1. Inhaled foreign bodies;med. J, Brit,1965
2. Intrathoracic foreign bodies;Le Roux, B.T.;Thorax,1964
3. Long-standing intrabronchial foreign bodies;Linton, T.S.A.;ibid,1957
4. Inhaled foreign bodies: some complications and errors;Powell, V.;ibid,1965