1. ISO 389-7: Acoustics – Reference zero for the calibration of audiometric equipment – Part 7: Reference threshold of hearing under the free-field and diffuse-field listening conditions,2005
2. ANSI S3.6: Specification for audiometers,2004
3. Sound field speech recognition thresholds for 67-S speech audiometric test lists in quiet and noise;Inoue;Audiol Japan,2002
4. Towards a theory of speech audiometry tests;Lyregaard,1997
5. Improvement of speech recognition by hearing aids;Kodera,2006