References
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- ISO 7029. Acoustics — threshold of hearing by air conduction as a function of age and sex for otologically normal persons. 1984.
- ISO 389. Acoustics — standard reference zero for the calibration of pure-tone air conduction audiometers. 1985.
- ISO 6189. Acoustics — pure tone air conduction threshold audiometry for hearing conservation pur-poses. 1986.
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