Reference
- Davis H. International standard reference zero for pure-tone audiometry. Trans. Amer. Acad. Ophthal. Otolaryng. 1955; 69: 112
- Juselius H. An audiometric survey of the incidence and causes of hearing defects among draftees in Finland 1954-1955. Acta Otolaryng. (Stockh.) 1962; 55: 393