References
- Berry G. The use and effectiveness of hearing aids. Laryngoscope 1939; 49: 912
- Holmgren L. Can the hearing be damaged by a hearing aid?. Acta Otolaryngol (Stockholm) 1940; 28: 440
- Markides A. Do hearing aids damage the user's residual hearing?. Sound (now British J Audiol) 1971; 5: 99–105
- Markides A. The effect of hearing aid use on the user's residual hearing. Scand Audiol 1976; 5: 205–210