1. L. D. Landau:JETP,7, 19, (1937); 627 (1937).
2. J. D. Van-der-Waals: Ph. D. Thesis, University of Leiden (1973).
3. F. Weiss:J. Phys. Rad.,6, 667 (1907).
4. R. Braut:Phase Transitions (Mir, Moscow, 1967) (in Russian);R. Braut:Phase Transitions (Benjamin, New York, N.Y. 1965).
5. L. D. Landau andE. M. Lifshitz:Statistical Physics (Oxford, Pergamon Press, 1958).