Reference
- Phillips W. C. Ann. Otol., Rhin. & Laryng. 1914; 23: 478
- Sheppard J. E. Ibid. 1914; 23: 480
- Shambaugh G. E. Arch. Otolaryng. Sept, 1929; 10: 217
- Ranger D. Journ. Laryng. & Otol. Nov, 1949; 63: 672
- Menck-Thygesen P. Acta oto-laryng. 1952; 42: 280
- Johnston W. R. Laryngoscope 1953; 1096
- Simonton K. M. Laryngoscope May, 1955; 65: 342
- Kler J. H. Ear, Nose and Throat Monthly 1948; 27: 29
- Vior P. H. Medicamenta Madrid 1951; 15: 200–364