1. Ball, F. K. 1960 Quart. J. R. Met. Soc. 86,483.
2. Rouse, H. & Dodu, J. 1955 La Houille Blanche,10,530.
3. Ellison, T. H. & Turner, J. S. 1959 J. Fluid Mech. 6,423.
4. Squires, P. 1958 Tellus,10,381.
5. Proudman, J. 1953 Dynamical Oceanography .London:Methuen.