1. S.K. Ma, Modern Theory of Critical Phenomena, Frontiers in Physics; 46 (Addison-Wesley,1976)
2. P. Pfeuty and G. Toulouse, Introduction to the Renormalization Group and to Critical Phenomena, 1st ed. (Wiley-Interscience, Chichester, 1978).
3. P.G. de Gennes and J. Prost, The Physics of Liquid Crystals, 2nd ed. (Clarendon Press, Oxford, 1993).
4. S. Chandrasekhar, Liquid Crystals (Cambridge University Press, 1992).
5. D. Belitz, T.R. Kirkpatrick, T. Vojta, Rev. Mod. Phys. 77 , 579 (2005).