- V. V. Arestov, “Best Uniform Approximation of the Differentiation Operator by Operators Bounded in the Space L2”, Proc. Steklov Inst. Math., 308, № S1, 2020, 9
- V. Arestov, “Uniform Approximation of Differentiation Operators by Bounded Linear Operators in the Space Lr”, Anal Math, 46, № 3, 2020, 425
- R. R. Akopyan, “Optimal Recovery of a Derivative of an Analytic Function from Values of the Function Given with an Error on a Part of the Boundary. II”, Anal Math, 46, № 3, 2020, 409