1. L. V. Ovsyannikov, N. I. Makarenko, V. I. Nalimov, et al., Nonlinear Problems in the Theory of Surface and Internal Waves [in Russian], Nauka, Novosibirsk (1985).
2. V. I. Bukreev, N. V. Gavrilov, and K. R. Znobishchev, ?Experimental study of waves in a two-layer fluid with a velocity shear between the layers,? in: Problems in Hydrodynamics with Free Boundaries. (Dynamics of a Continuous Medium, Issue 64) [in Russian], Novosibirsk (1984), pp. 3?10.
3. S. A. Thorpe, ?Experiments on the instability of stratified shear flows: immiscible fluids,? J. Fluid Mech.,39, 25 (1969).
4. I. R. Wood and J. E. Simpson, ?Jumps in layered miscible fluids,? J. Fluid Mech.,140, 329 (1984).
5. J. J. Stoker, Water Waves, the Mathematical Theory with Applications, Wiley, New York (1957).