1. K. Kuratowski, Topology, Vol. 1 (Academic Press, New York–London; Panstwowe Wydawnictwo Naukowe, Warsaw, 1966; Mir, Moscow, 1966).
2. V. I. Bogachev and O.G. Smolyanov, Real and Functional Analysis (NITs “Regular and Chaotic Dynamics,” Moscow–Izhevsk, 2011) [in Russian].
3. A. N. Kolmogorov and S. V. Fomin, Elements of the Theory of Functions and Functional Analysis (Nauka, Moscow, 1972; “Introductory Real Analysis,” Dover Publications, Inc., New York, 1975).
4. G. E. Shilov, Mathematical Analysis. Second Special Course (Nauka, Moscow, 1965) [in Russian].
5. A. A. Kirillov and A. D. Gvishiani, Theorems and Problems in Functional Analysis (Nauka,Moscow, 1979; Springer-Verlag, New York–Berlin, 1982).