ZHYHALLO, T. V.; KHARKEVYCH, Yu. I. Approximation of functions defined on the real axis by operators generated by λ-methods of summation of their Fourier integrals. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 9, p. 1267–1280, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3840. Acesso em: 5 dec. 2025.