1973, Dunegan/Endevco Tech News, 1
Stone, 1974
Hatano, 1976, Acoustic emission transducer and its absolute calibration, J Acoust Soc Am, 59, 10.1121/1.380869
Speake, J.Private Communication (NDT Centre, UKAEA)
Bentley, 1974
McBridge, 1976, Helium gas jet spectral calibration of acoustic emission transducers and systems, Can J of Phys, 54
Bentley, 1976, A method of calibration for acoustic emission measurements
Aitchson, 1975