HRABOVA, U. Z.; KALCHUK, I. V.; STEPANYUK, T. A. Approximation of functions from the classes $W_{β}^r H^{α }$ by Weierstrass integrals. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 4, p. 510–519, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1712. Acesso em: 5 dec. 2025.