O. V. Akopyan, R. R. Akopyan, “Optimal Recovery on Classes of Functions Analytic in an Annulus”, Proc. Steklov Inst. Math., 321, suppl. 1 (2023), S4–S19
V. Arestov, “Uniform Approximation of Differentiation Operators by Bounded Linear Operators in the Space Lr”, Anal Math, 46:3 (2020), 425
R. R. Akopyan, “Approximation of Derivatives of Analytic Functions from One Hardy Class by Another Hardy Class”, Proc. Steklov Inst. Math., 308, suppl. 1 (2020), S1–S8
V. V. Arestov, “Best Uniform Approximation of the Differentiation Operator by Operators Bounded in the Space $L_2$”, Proc. Steklov Inst. Math., 308, suppl. 1 (2020), S9–S30