S. B. Vakarchuk, M. Sh. Shabozov, “The widths of classes of analytic functions in a disc”, Sb. Math., 201:8 (2010), 1091–1110
M. Sh. Shabozov, M. R. Langarshoev, “The best linear methods and values of widths for some classes of analytic functions in the Bergman weight space”, Dokl. Math., 87:3 (2013), 338–341