1. Sherwood TR. Euromet Project 363 Harmonisation of audiometry measurements within Europe. Final Report. NPL Report CMAM 001; 1997
2. Audiometer calibration: interpreting and applying the standards;Lightfood;Br J Audiol,2000
3. Audiometer calibration: two neglected areas;Smith;Br J Audiol,1997
4. ISO Ed. 1.0 1993. Guide to the expression of uncertainty in measurement (reprinted 1995)
5. IEC 60318-1 Ed. 1.0 1998. Electroacoustics – Simulators of human head and ear. Part 1: ear simulator for the calibration of supra-aural earphones