1. M. G. Silk and Idington, B. H. L ?Defect sizing using an Ultrasonic Time Delay Approach,? Br. J. NDT March, pp. 33?36 (1975).
2. M. G. Silk, ?Sizing Crack-like Defects by Ultrasonic Means,? In Research Techniques in Nondestructive Testing, Vol. 3, pp. 51?79, (1997), Academic Press, New York.
3. M. G. Silk, ?The transfer of ultrasonic energy in the diffraction technique for crack sizing.? Ultrasonics May, pp. 113?120, (1979).
4. British Standard BS7706, ?Guide to Calibration and Setting-up of Ultrasonic Time of Flight Diffraction (TOFD) Technique for Defect Detection, Location and Sizing of Flaws,? British Standard Institution, 1993.
5. A. A. A. Scheerder, ?Equipment Condition Monitoring Using TOFD?Experiences at DSM,? in 15th WCNDT, 2000, Roma. Available from http://www.ndt.net/article/wcndt 00/papers /idn070/idn070.htm