1. American National Standards Institute (ANSI). Methods for measuring the real-ear attenuation of hearing protectors (Standard No. ANSI S12.6-1997). New York, NY, USA: ANSI; 1997.
2. International Organization for Standardization (ISO). Acoustics—determination of sound immissions from sound sources placed close to the ears—part 1: technique using microphones in real ears (MIRE-technique) (Standard No. ISO 119041:2002). Geneva, Switzerland: ISO; 2002.
3. International Organization for Standardization (ISO). Acoustics—hearing protectors—part 3: measurement of insertion loss of ear-muff type protectors using an acoustic test fixture (Standard No. ISO TR 4869-3:1989). Geneva, Switzerland: ISO; 1989.
4. American National Standards Institute (ANSI). Method for the measurement of real-ear protection of hearing protectors and physical attenuation of earmuffs (Standard No. ANSI S3-19-1974). New York, NY, USA: ANSI; 1974.
5. Franke R, Parmentier G, Evrard G, Kronenberger G, Beck C, Brunner JJ. Tête artificielle pour l'évaluation de l'efficacité des protecteurs vis-à-vis de bruits de niveaux élevé. I: développement et essais en régime impulsionnel (Report No. ISL R 112/94). Saint-Louis, France: French-German Research Institute of Saint-Louis (ISL); 1994.