1. Hasselmann, K. 1966 Feynman diagrams and interaction rules of wave—wave scattering processes.Rev. Geophys. 4,1–32.
2. Benjamin, T. B. & Feir, J. E. 1967 The disintegration of wave trains on deep water. Part 1. Theory.J. Fluid Mech. 27,417–30. Part 2. Experiments. J. Fluid Mech. (to appear).
3. Whitham, G. B. 1967 Variational methods and applications to water waves.Proc. Roy. Soc. A299,6–25.
4. Whitham, G. B. 1966 Nonlinear dispersion of water waves.J. Fluid Mech. 27,399–412.
5. Kelly, R. E. 1967 On the stability of an inviscid shear layer which is periodic in space and time.J. Fluid Mech. 27,657–89.