1. Lighthill, M. J. 1978 Waves in Fluids .Cambridge University Press.
2. Hogg, N. G. 1973 J. Fluid Mech. 58,517.
3. Redekopp, L. G. 1975 Geophys. Fluid Dyn. 6,289.
4. Stewartson, K. & Cheng, H. K. 1979 J. Fluid Mech. 91,415.
5. Lighthill, M. J. 1967 J. Fluid Mech. 27,725.