1. V. I. Arnold, Catastrophe Theory (Springer-Verlag, Berlin, 1992; Nauka, Moscow, 1990).
2. Yu. K. Alekseev and A. P. Sukhorukov, Introduction to the Theory of Catastrophes, 2nd ed. (Librokom, Moscow, 2009) [in Russian].
3. T. Poston and I. Stewart, Catastrophe Theory and its Applications (Pitman, London, 1978; Mir, Moscow, 1980).
4. G. G. Malinetsky, Mathematical Foundations of Synergetics: Chaos, Structures, Computational Experiment, 5nd ed. (Librokom, Moscow, 2007) [in Russian].
5. B. Bukhovtsev, V. Krivchenkov, G. Myakishev, and V. Shalnov, Problems in Elementary Physics (Mir Publ., Moscow, 1978; Nauka, Moscow, 1974).