1. M. S. Longuet-Higgins, ?Mass transport in water waves,? Philos. Trans., A245, 535 (1953).
2. Yu. D. Borisenko, A. G. Voronovich, A. I. Leonov, and Yu. Z. Miropol'skii, ?Theory of of unsteady weakly nonlinear internal waves in stratified fluids,? Izv. Akad. Nauk SSSR, Fiz. Atmos. Okeana,12, 293 (1976).
3. G. S. Dvoryaninov, I. E. Timchenko, and A. E. Chekhlan, ?Theory of the Generation of steady flows in a boundary layer by surface waves,? in: Marine Hydrophysical Investigations, No. 1 [in Russian], Sevastopol' (1978), pp. 5?14.
4. B. D. Dore, ?Mass transport in layered fluid systems,? J. Fluid Mech.,40, 113 (1970).
5. K. Toshimitsu, I. Makoto, and T. Toidiro, ?Statistical properties of internal waves at the interface of two-layered flows,? Kyudai Kogako Syukho [Russian translation AGR-2644,52, No. 1 (1979)].