References
- Huizing E. H., van Bolhuis A. H., Odenthal D. W. Studeis on progressive hereditary perceptive deafness in a family of 335 members 1. Genetical and general audiological results. 2. Characteristic pattern of hearing deterioration. Acta oto-laryng., Stockh. 1966; 61: 35–41, 161–162
- Spoor A., Passchier-Vermeer W. Spread in hearing-levels of non-noise exposed people at various ages. Int. Audiol. 1969; 9: 328–336