I. A. Shevchuk, “Approximation of monotone functions by monotone polynomials”, Mat. Sb., 183:5 (1992), 63–78; Russian Acad. Sci. Sb. Math., 76:1 (1993), 51–64
I. A. Shevchuk, “Addendum to direct approximation theorems of S. M. Nikol'skij type on an interval, and inverse theorems”, Trudy Mat. Inst. Steklov., 180 (1987), 230–232; Proc. Steklov Inst. Math., 180 (1989), 273–274
1986
5.
I. A. Shevchuk, “Uniform approximation of functions on an interval”, Mat. Zametki, 40:1 (1986), 36–48; Math. Notes, 40:1 (1986), 521–528
1983
6.
I. A. Shevchuk, “Traces of functions of the class $H^\varphi_k$ on the line”, Dokl. Akad. Nauk SSSR, 273:2 (1983), 313–314
7.
V. K. Dzyadyk, I. A. Shevchuk, “Extension of functions that are traces on an arbitrary subset of the line of functions with given second modulus of continuity”, Izv. Akad. Nauk SSSR Ser. Mat., 47:2 (1983), 248–267; Math. USSR-Izv., 22:2 (1984), 227–245
I. A. Shevchuk, “Constructive characterization of classes of continuous functions on a set $\mathfrak M\subset C$ for the $k$-th modulus of continuity”, Mat. Zametki, 25:2 (1979), 225–247; Math. Notes, 25:2 (1979), 117–129
N. P. Korneichuk, S. M. Nikol'skii, I. A. Shevchuk, “Vladislav Kirillovich Dzyadyk (on his sixtieth birthday)”, Uspekhi Mat. Nauk, 34:4(208) (1979), 231–237; Russian Math. Surveys, 34:4 (1979), 213–221
S. M. Nikol'skii, N. P. Korneichuk, I. A. Shevchuk, “Vladislav Kirillovich Dzyadyk (on his seventieth birthday)”, Uspekhi Mat. Nauk, 44:4(268) (1989), 243–244; Russian Math. Surveys, 44:4 (1989), 213–215
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