1. Ballard, S. S. (Ed.), 1959: A collection of papers on infrared measurements. Proc. Inst. Rad. Eng.
2. Ewing, G., 1950: Slicks, surface films and internal waves. J. Mar. Res.9, 61.
3. Harrison, W. J., 1908: The influence of viscosity on the oscillation of superposed fluids. Proc. London Math. Soc. (2),6, 396.
4. La Fond, E. C., 1962: Internal waves. In: M. N. Hill (Ed.), The Sea.1, 731. New York.
5. Lamb, H., 1932: Hydrodynamics. 6th ed. Cambridge.