1. Landau, L.D., Phys. Ztshr. Sow., 1933, vol. 4, p. 675.
2. Gufan, Yu.M., Strukturnye fazovye perekhody (Structural Phase Transitions), Moscow: Nauka, 1982.
3. Bouckaert, L.P., Smoluchowski, R., and Wigner, E., Phys. Rev., 1936, vol. 50, no. 1, pp. 58–67.
4. Toledano, J.-C. and Toledano, P., The Landau Theory of Phase Transitions, Singapore-New Jersey-Hon Kong: Word Sci. 1987.
5. Gufan, A.Yu., Zh. Eksp. Teor. Fiz., 2007, vol. 132, no. 1(7), pp. 138–149.