1. A tooth in the pleural cavity;Davidsohn;Am. J. M. Sc.,1931
2. Perforation of the pleura by an inspired foreign body;Graham;California & West. Med.,1929
3. Thoracoscopic removal of broken aspirating needle; case;Andrews;J. Thoracic Surg.,1937
4. Aplicationes de la endoscopia pleural;Pascual;Med. ibera,1935
5. Über Fremdkörper im Pleuraraum;Scheidel;Med. Klin.,1937