1. J.D. Achenbach, A. Gautesen and H. McMaken, Ray Methods for Waves in Elastic Solids (Pitman Publishers, in press).
2. J.D. Achenbach and A. Norris, “Crack Characterization by the Combined Use of Time-domain and Frequency-domain Scattering Data,” 1981 AF/DARPA - Review of Quantitative NDE.
3. A. Norris and J. D. Achenbach, “Mapping of a Crack Edge by Ultrasonic Methods,” J. Acoust. Soc. Am. 72, 264 (1982).
4. A. Norris, “Inverse Ray Tracing in Elastic Solids with Unknown Anisotropy,” submitted for publication.
5. M.J.P. Musgrave, Crystal Acoustics (Holden-Day, San Francisco,1979)