2009EN ISO 8253-2:2009 Acoustics - Audiometric test methods - Part 2: Sound field audiometry with pure-tone and narrow-band test signals (ISO 8253-2:2009)
1998EN ISO 8253-2:1998 Acoustics - Audiometric Test Methods - Part 2: Sound Field Audiometry with Pure Tone and Narrow-Band Test Signals ISO 8253-2:1992