1. S. P. Kuznetsov, Dynamical Chaos (Fizmatlit, Moscow, 2006) [in Russian].
2. H. G. Schuster, Deterministic Chaos: An Introduction (Physik Verlag, Weinheim, 1984; Mir, Moscow, 1988).
3. A. Yu. Loskutov and A. S. Mikhailov, Introduction to Synergetics (Nauka, Moscow, 1990) [in Russian].
4. Zh.-P. Ekman, in Synergetics: Collection of Scientific Works, Ed. by B. B. Kadomtsev (Mir, Moscow, 1984), pp. 190–219.
5. P. de Gennes, Physics of Liquid Crystals (Clarendon, Oxford, 1974; Mir, Moscow, 1977).