STEPANETS , A. I. Approximation by the Fourier operators of the functions preset on a real axis. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 2, p. 198–209, 1988. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9116. Acesso em: 6 dec. 2025.