1. Electromechanical transducers and wave Filters;Mason,1948
2. Piezoelectric crystals and their application to ultrasonics;Mason,1950
3. Ultrasonic transducers;Bradfield,1964
4. Berlincourt, D., Jaffe, B., Jaffe, H., and Krueger, H.H.A., ‘Transducer properties of lead titanate zirconate ceramics’, 1959 IRE National Convention Record, Part 6, p227
5. Use in industry of elasticity measurements in metals with the help of mechanical vibrations;Bradfield,1964