VAKARCHUK, S.; ZABUTNA , V.; VAKARCHUK, M. Averaged characteristics of smoothness in $L_2$ and estimations for the widths values of function classes. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 77, n. 2, p. 83–106, 2025. DOI: 10.3842/umzh.v77i2.8794. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8794. Acesso em: 7 apr. 2025.