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. J. W. Miles, ?Internal waves generated by a horizontally moving source,? Geophys. Fluid Dynamics,2, 63 (1971).
3. M. J. Lighthill, Waves in Fluids, Cambridge (1978).
4. M. Yanovitch, ?Gravity waves in a heterogeneous incompressible fluid,? Commun. Pure Appl. Math.,15, 45 (1962).
5. V. A. Borovikov and M. Ya. Kel'bert, ?The field near a wave front in the Cauchy-Poisson problem,? Izv. Akad. Nauk SSSR, Mekh. Zhidk. Gaza, No. 2, 173 (1984).