1. Low frequency acoustic NDT methods;Lange;Sov J NDT,1978
2. Characteristics of the impedance method of inspection and of impedance inspection transducers;Lange;Sov J NDT,1978
3. Design of the transducer in differential probe heads of impedance type defectoscopes;Lange;Sov J NDT,1975
4. The location of defects in structures from measurements of natural frequencies;Cawley;J Strain Analysis,1979
5. Defect location in structures by a vibration technique;Cawley,1979