1. Mueller, H.: Quoted by Foster-Carter, A. F., p. 174.6
2. Heine, J.: Quoted by Foster-Carter, A. F., p. 174.6
3. Intrabronchial Polypoid Adenoma; Report of a Case;Reisner;Arch. Surg.,1928
4. Kramer, R.: Quoted by Foster-Carter, A. F., p. 174.6
5. Benign Tumors of the Bronchus;Wessler;Am. J. M. Sc.,1932