1. V. F. Ignatenko, “Infinite transparent groups generated by skew reflections,” in: Abstracts of the International Conference on Geometry “as a Whole” [in Russian], Cherkassy (1995), pp. 33–34.
2. V. F. Ignatenko, “Rebuilding method and wild groups of skew symmetries,” in: Abstracts of the Second Crimean Mathematical School “Method of Lyapunov Functions and Its Applications” [in Russian], Simferopol, (1995), pp. 24–25.
3. E. B. Vinberg and V. L. Popov, “Theory of invariants,” in: VINITI Series in Contemporary Problems of Mathematics. Fundamental Trends [in Russian], Vol. 55, VINITI, Moscow (1989), pp. 137–309.
4. V. F. Ignatenko, “On the geometric theory of invariants of groups generated by reflections,” in: VINITI Series in Problems of Geometry [in Russian], Vol. 21, VINITI, Moscow (1989), pp. 155–208.
5. P. J. Olver, Applications of Lie Groups to Differential Equations, Springer (1986).