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2. Achenbach, J.D., Gautesen, A.K., and McMaken, H., “Application of Geometrical Diffraction Theory to QNDE Analysis,” ARPA/AFML Review of Progress in QNDE, edited by D. O. Thompson, Science Center Rockwell International, Thousand Oaks, Cal., January 1979.
3. Achenbach, J.D., Adler, L., Lewis, D. Kent and McMaken, H., “Diffraction of Ultrasonic Waves by Penny-Shaped Cracks in Metals: Theory and Experiment,” J. Acoust. Soc. Am. 1979.
4. Achenbach, J.D., Viswanathan, K., and Norris, A., “An Inversion Integral for Crack- Scattering Data,” WAVE MOTION 1(4), 299–316, 1979.
5. Gautesen, A.K., Achenbach, J.D. and McMaken, H., “Surface-wave Rays in Elastodynamic Diffraction by Cracks,”, J. Acoust. Soc. Am. 63, 1978.