1. Development of a Unique Passive Hearing Protector with Level-Dependent and Flat Attenuation Characteristics
2. ANSI S12.42. 2010. American National Standard Methods for the Measurement of Insertion Loss of Hearing Protection Devices in Continuous or Impulsive Noise Using Microphone-in-Real-Ear or Acoustic Test Fixture Procedures. American National Standards Institute, New York.
3. ANSI S12.6. 2008. American National Standard Methods for Measurement of Real-ear Attenuation of Hearing Protectors. American National Standards Institute, New York.
4. ANSI S12.68. 2007. American National Standard Methods of Estimating Effective A-Weighted Sound Pressure Levels When Hearing Protectors are Worn. American National Standards Institute, New York.