1. Dowden, W. (NDT Centre, Harwell) ‘Information and communications in NDT’
2. Pelc, A. (Tesla Vust) ‘Non-destructive measurement by evaluating the free running oscillations of a measuring circuit’
3. Lloyd, A.E., ‘Signal processing of eddy-current indications’
4. Birchon, D. (Admiralty Materials Laboratory) ‘The LEO technique’
5. Birk, A.S. (Automation Industries, UK) ‘The DELTA technique’