1. L. D. Landau and E. M. Lifshits, Mechanics of Continuous Media [in Russian], Gostekhizdat, Moscow (1953).
2. A. S. Monin and I. M. Yaglom, Statistical Fluid Mechanics, M. I. T. Press.
3. V. E. Zakharov and N. N. Filonenko, Dokl. Akad. Nauk SSSR,170, No. 6, 1292 (1966); Zh. Prikl. Matem. i Tekh. Fiz., No. 2, 62 (1967).
4. K. Hasselman, in: Nonlinear Theory of Wave Propagation [Russian translation], Izd. Mir, Moscow (1970); Proc. Roy. Soc.,299A, No. 1456 (1967).
5. V. E. Zakharov, Zh. Prikl. Matem. i Tekh. Fiz., No. 2 (1968).