1. E. Hopf, ?A mathematical example displaying features of turbulence,? Commun. Pure Appl. Math.,1, 303?322 (1948).
2. C. Foias and G. Prodi, ?Sur le comportement global des solutions nonstationaires des equations de Navier-Stokes en dimension 2,? Rend. Semin. Matem. Univ. Padova,39, 1?34 (1967).
3. O. A. Ladyzhenskaya, Mathematical Aspects of Viscous Incompressible Fluid Dynamics [in Russian], Nauka, Moscow (1970).
4. O. A. Ladyzhenskaya, ?Integral estimates, the convergence of approximative methods, and solutions in functionals for linear elliptic operators,? Vest. Leningrad. Gos. Univ., No. 7, 60?69 (1958).
5. V. V. Nemytskii and V. V. Stepanov, Qualitative Theory of Differential Equations [in Russian], GITTL, Moscow (1949).