1. Constant beamwidth transducers for use in sonar with very wide frequency bandwidths;Berktay;Department of Electronic and Electrical Engineering, University of Birmingham Memo,1967
2. Broad-band constant beam-width transducers;Morris;Journal of Sound and Vibration,1964
3. Wideband sonar, report on second trials;Dunn;Department of Electronic and Electrical Engineering, University of Birmingham Memo,1968
4. A review of progress in underwater acoustics;Tucker;Radio and Electronic Engineer,1969
5. Possible exploitation of nonlinear acoustics in underwater transmitting applications;Berktay;Journal of Sound and Vibration,1965