Reference
- BJERKNES, V., BJERKNES, J., SOLBERG. H., BERGERON, T., 1933, Hydrodynamique Physique. J. Springer, Berlin.
- PROUDMAN, J., 1942, On Laplaces Differential Equations for the Tides, Proc. Roy. Soc., A, No.978, vol. 179, 261–288.
- SOLBERG, H., 1936, Vber die freien Schwingungen einer homogenen Flüssigkeitsschicht auf der rotie-renden Erde. Astrophys. Norveg. 1, pp. 237–340.
- VERONIS, G., 1963, On the approximations involved in transforming the equations of motion from a spherical surface to the fl-plane. J. Mar. Res., 21, p. 1.