1. Andersen, K.H., 1999. Ripples beneath surface waves and topics in shell models of turbulence. PhD Thesis, Technical University of Denmark, Department of Hydrodynamics and Water Resources (ISVA). See also the following web site: http://www.nbi.dk/~kenand/Thesis.html.
2. Bed shear stress over a smooth bed in three-dimensional wave-current flow;Arnskov;Coastal Eng.,1993
3. Asano, T., Iwagaki, Y., 1984. Bottom turbulent boundary layer in wave–current co-existing systems. Proc. 19th Int. Conf. on Coastal Eng., Chap. 161. Houston, TX, USA, pp. 2397–2413.
4. Asano, T., Nakagawa, M., Iwagaki, Y., 1986. Changes in current properties due to wave superimposing. Proc. 20th Int. Conf. on Coastal Eng., Chap. 70. Taipei, Taiwan, pp. 925–939.
5. Aydin, I., 1987. Computation and analysis of unsteady turbulent flow on flat bottom and over rigid ripples. Thesis for the Degree of Doctor of Engineering. Tohoku University, Sendai, Japan, July, 1987.