1. Wüstenberg, H., Kutzmer, J. and Engl, G. Dependence of echo amplitude on defect orientation in ultrasonic examinations. 8th World Conference on NDT, 1979, Cannes, France.
2. P. Jehenson et al. Seminars on “Characterization of Ultrasonic Equipment” Ispra Courses, CEC, JRC Ispra, 13 June 1977 and 9–12 October 1979.
3. The PISC I Report, EUR 6371en, Vols. 1 to 6, 1979, 1980.
4. The UKAEA defect detection trials;Watkins;British Journal of NDT,1983
5. Ultrasonic Inspection of Heavy Section Steel Components. The PISC II Final Report;Nichols,1988