1. Bagnold, R. A., 1946: Motion of waves in shallow water. Interaction between waves and sand bottoms. Proc. R. Soc. (A)187, 1.
2. Blackman, R. B. and J. W. Tukey, 1958: The measurement of power spectra from the point of view of communications engineering. New York: Dover Publ. Inc.
3. Bretschneider, C. L. and R. O. Reid, 1954: Changes in wave height due to bottom friction, percolation and refraction. Techn. Mem. US Army Beach Eros. Bd., No. 45, 36 pp.
4. Darbyshire, J., 1961: The one-dimensional wave spectrum in the Atlantic and in coastal waters. In: Ocean Wave Spectra. Prentice Hall, p. 27.
5. Hasselmann, K., T. P. Barnett, E. Bouws et al., 1973: Measurements of wind-wave growth and swell decay during the Joint North Sea Wave Project (JONSWAP), Dt. hydrogr. Z. Erg.-H. A, Nr. 12.