1. A.N. Norris, J.D. Achenbach, L.A. Ahlberg and B.R.Tittmann, “Further Results for Crack-Edge Mappings by Ray Methods, this volume.
2. J.D. Achenbach and A.N. Norris, “Crack Characterization by the Combined Use of time-Domain and Frequency-Domain Scattering Data,” 1981 AF/DARPA Review of Quantitative NDE, Plenum Publishing Corp.
3. J.D. Achenbach, A.N. Norris and K. Viswanathan, “Mapping of Crack Edges by Seismic Methods,” Bull. Seism. Soc. Am. 72, pp. 779–792 (1982).
4. A.N. Norris and J.D. Achenbach, “Mapping of a Crack Edge by Ultrasonic Methods,” J. Acoust. Soc. Am. 72, pp. 164–272(1982).
5. J.D. Achenbach, A.N. Norris, L. Ahlberg and B.R. Tittmann, “Crack Mapping by Ray Methods,” 1982 Review of Progress in Quantitative NDE, Plenum Publishing Co.