1. Methods of measuring the attenuation of hearing protection devices;Berger;J. Acoust. Soc. Am.,1986
2. Objective test for ear-muffs;Russell;J. Sound Vibr.,1976
3. A test facility for the objective measurement of circumaural hearing protector attenuation;Chillery,1982
4. G.W. Redmond, K.V. Stewart, E.J. Burgi and R.C. Bartholomae, Comparison of E-M attenuation as measured by psychophysical and physical methods, Proceedings of Inter-Noise 80, 659-62
5. The in-situ measurement of the attenuation of hearing protectors by the use of miniature microphones;Rood,1982