1. H. N. G. Wadley, C. B. Scruby, and J. Speake, Int. Met. Rev. 25(2), 41 (1980).
2. W. Sachse and N. Hsu, Physical Acoustics XIV (1980).
3. J. C. Spanner, “Advances in Acoustic Emission,” Proc. Int. Conf. Acoustic Emission, Anaheim, CA (1979)
4. H. L. Dunegan and W. F. Hartman, Eds., Dunhart (1981).
5. J. M. Carlyle, J. Acoustic Soc. Am., Suppl. 1, 68, S104 (1980).