1. Anosov, D. V., Structurally Stable Systems, Tr. Mat. Inst. Steklova, 1985, vol. 169, pp. 59–93 (Russian).
2. Efremova, L. S., On the Concept of the $$\Omega$$-Function of the Skew Product of Interval Mappings, J. Math. Sci. (N. Y.), 2001, vol. 105, no. 1, pp. 1779–1798; see also: Dynamical Systems, Itogi Nauki Tekh. Ser. Sovrem. Mat. Prilozh. Temat. Obz., vol. 67, Moscow: VINITI, 1999, pp. 129–160.
3. Efremova, L. S., New Set-Valued Functions in the Theory of Skew Products of Interval Maps, Nonlinear Anal., 2001, vol. 47, no. 8, pp. 5297–5308.
4. Efremova, L. S., Set-Valued Functions and Dynamics of Skew Products of Interval Maps, in Progress in Nonlinear Science (Nizhny Novgorod, 2001): Vol. 1, L. M. Lerman, L. P. Shil’nikov (Eds.), Nizhniy Novgorod: RAS, Inst. Appl. Phys., 2002, pp. 219–224 (Russian).
5. Efremova, L. S., $$\Omega$$-Stable Skew Products of Interval Maps Are not Dense in $$T^{1}(I)$$, Proc. Steklov Inst. Math., 2002, vol. 236, pp. 157–163; see also: Tr. Mat. Inst. Steklova, 2002, vol. 236, pp. 167-173.