References
- Henninger. Deutsche Zeitschr. f. Chir. 1932; 237: 632
- Höston. Oto-Laryng. Ges. Christiania. 1919; 27
- Morton. Glasgow Med. Journ. Oct., 1912
- Neumann. Virchows Arch. 1861; 20: 142
- Teleky. Z. Heilk. 1904; 25/II: 1
- Zenker. Ziemssen's Handbuch. spez. Path. u. Ther. 1874; VII/I: 183