1. Belinoff, 2nd International Congress of Otolaryngology, Arch. Otolaryng. 18: 398, 1933.
2. Gunning D. S., Arch. Otolaryng. 36: 662, 1942.
3. Eggston A. E. and Wolff D., Histopathology of the Ear, Nose and Throat, Baltimore, the Williams and Wilkins Company, 1947, page 714–720.
4. Ghosh L. M. and Panja D., Ind. Med. Gazette, 80: 511, 1945.
5. Goyal R. K., Sarin J. C, and Narayanan G., Indian Journal of Otolaryngology, 8: 120, 1956