1. L. D. Landau, Zh. Eksp. Teor. Fiz. 7, 627 (1937).
2. A. Z. Patashinskii and V. L. Pokrovskii, Fluctuation Theory of Phase Transitions (Pergamon, London, 1979; Nauka, Moscow, 1982).
3. A. P. Levanyuk, Sov. Phys. JETP 9, 571 (1959).
4. V. A. Ginzburg, Sov. Phys. Solid State 2, 1824 (1960).
5. L. D. Landau and I. M. Khalatnikov, Dokl. Akad. Nauk SSSR 96, 469 (1954).