SHABOZOV, M. Sh.; AKOBIRSHOEV , M. O. Mean-square approximation by an angle in $L_2$ and the values of quasiwidths for some classes of functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 72, n. 6, p. 852–864, 2020. DOI: 10.37863/umzh.v72i6.1064. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1064. Acesso em: 15 dec. 2025.