1. L. D. Landau, Collected Works, Vol. 2 [in Russian], Nauka, Moscow (1969).
2. E. M. Lifshitz and L. P. Pitaevskii, Statistical Physics, Part 2 [in Russian], Nauka, Moscow (1978).
3. S. L. Sobolev Introduction to the Theory of Cubature Formulas [in Russian], Nauka, Moscow (1974).
4. O. A. Ladyzhenskaya, Mathematical Problems in the Dynamics of Viscous Incompressible Fluids [in Russian], Nauka, Moscow (1970).
5. E. B. Bykhovskii and N. V. Smirnov, ?On orthogonal decompositions of a space of vector functions that are square summable over a given region,? Tr. Mosk. Inst. Akad. Nauk SSSR,59, 6 (1960).