1. L. D. Landau and E. M. Lifshitz, Mechanics of Continua [in Russian], 2nd edition, Gostekhizdat, 1953.
2. L. D. Landau and E. M. Lifshitz, Theoretical Physics [in Russian], 2nd edition, vol. 1, Mechanics, Izd-vo Nauka, 1965.
3. N. N. Bogolyubov and Yu. A. Mitropol'skii, Asymptotic Methods of Nonlinear Oscillation Theory [in Russian], Gostekhizdat, 1955.
4. O. A. Ladyzhenskaya, Mathematical Questions of Dynamics of Viscous Incompressible Fluids [in Russian], Fizmatgiz, 1961.
5. V. I. Yudovich, ?On the stability of steady flows of a viscous incompressible fluid?, DAN SSSR, vol. 161, no. 5, 1965.