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3. A. V. Gladkii, Formal Grammars and Languages (Nauka, Moscow, 1973; Elsevier, New York, 1982).
4. V. A. Zorich, Mathematical Analysis II (Nauka, Moscow, 1984; Springer, Berlin, 2004).
5. Yu. S. Il’yashenko, Selected Problems of the Theory of Dynamical Systems (Izd. MTsNMO, Moscow, 2011) [in Russian].