References
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- Van Dishoeck H. A. E. Tubal disorders and the pneumophone. Acta Otolaryng. 1950; 51: 3–4
- Flisberg K. The Pneumophone: Int. Audiol. 1962; 1: 231
- Flisberg K. Ventilatory studies on the Eustachian tube. A clinical investigation of cases with perforated eardrums. Acta Otolaryng. 1966; 219: 82