References
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- ISO Recommandation R 389, standard reference zero for the calibration of pure-tone audiometers. 1964, ISO/R 389-1964 (E), international organization for standardization ed. 1
- Riley E. C. Ten years' experience with industrial audiometry. Amer. Industr. Hyg. Assoc. J. 1961; 22: 151–159
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