1. An Evaluation of Single Probe Bulk Wave Time Delay Techniques in Sizing Cracks in Steel;Silk;NDT Int,1977
2. Defect Sizing Using the Time Delay of Diffracted Ultrasound. Detection and Measurement of Cracks;Silk,1976
3. A New Method for Crack Depth Determination in Ultrasonic Materials Testing;Böttcher,1973
4. Acoustic Pulses Scattered by a Rigid Sphere Immersed in a Fluid;Rugers;JASA,1968