1. Akamatsu, T., Wang, D., Wang, K., and Naito, Y. (2005), Biosonar behaviour of free-ranging porpoises, Proceedings of the Royal Society of London Series B, 272, 797–801.
2. Aroyan, J.L., McDonald, M.A., Webb, S.C., Hildebrand, J.A., Clark, D., Laitman, J.T., and Reidenberg J.S. (2000), Acoustic Models of Sound Production and Propagation. In: Hearing by Whales and Dolphins. Au W.W.L., Popper A.N., Fay R.R. (eds.), New York: Springer-Verlag, pp. 409–469.
3. Au, W.W.L. (1993), The sonar of dolphins. Springer-Verlag, New York, Berlin, London, Tokyo, pp. 277.
4. Au, W.W.L., Popper, A.N., and Fay, R.R. (eds.) (2000), Hearing by Whales and Dolphins. Springer Handbook of Auditory Research, Springer-Verlang, New York, pp. 485.
5. Au, W.W.L. and Benoit-Bird, K.J. (2003) Automatic gain control in the echolocation system of dolphins, Nature, 423, 861–863.