1. L. Onsager, Phys. Rev. 65, 117 (1944)
2. L. Landau, E. Lifshitz, Statistical Physics Part I (Pergamon, Oxford, 1980)
3. V. Ginzburg, Zh. Eksp. Teor. Fiz. 15, 739 (1945) [J. Phys. USSR 10 107(1946)]
4. V. Ginzburg, Zh. Eksp. Teor. Fiz. 19, 36 (1949)
5. K. Ishikawa et al., Phys. Rev. B 37, 5852 (1988)