M. Sh. Shabozov, G. A. Yusupov, “On the best polynomial approximation of functions in the Hardy space $H_{q,R}, (1\le q\le\infty, R\ge 1)$”, Chebyshevskii Sb., 24:1 (2023), 182–193
M. Sh. Shabozov, G. A. Yusupov, J. J. Zargarov, “On the best simultaneous polynomial approximation of functions and their derivatives in Hardy spaces”, Trudy Inst. Mat. i Mekh. UrO RAN, 27:4 (2021), 239–254
M. Sh. Shabozov, G. A. Yusupov, “Best approximation methods and widths for some classes of functions in $H_{q,\rho}$, $1\le q\le\infty$, $0<\rho\le1$”, Sibirsk. Mat. Zh., 57:2 (2016), 469–478; Siberian Math. J., 57:2 (2016), 369–376
G. A. Yusupov, “Exact Values of Widths of Some Functional Classes in $L_{2}$ and Minimization of the Constants in Inequalities of Jackson–Stechkin Type”, Model. Anal. Inform. Sist., 20:5 (2013), 106–116
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M. Sh. Shabozov, G. A. Yusupov, “On the exact values of mean $\nu$-widths of some classes of entire functions”, Trudy Inst. Mat. i Mekh. UrO RAN, 18:4 (2012), 315–327
M. Sh. Shabozov, G. A. Yusupov, “Best Polynomial Approximations in $L_2$ of Classes of $2\pi$-Periodic Functions and Exact Values of Their Widths”, Mat. Zametki, 90:5 (2011), 764–775; Math. Notes, 90:5 (2011), 748–757
M. Sh. Shabozov, G. A. Yusupov, “Exact constants in Jackson-type inequalities and exact values of the widths of some classes of functions in $L_2$”, Sibirsk. Mat. Zh., 52:6 (2011), 1414–1427; Siberian Math. J., 52:6 (2011), 1124–1136
