STEPANETS, O. I.; WANG, Kunyang; ZHANG, Xirong. Approximation of locally integrable functions on the real line. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 11, p. 1549–1561, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4756. Acesso em: 5 dec. 2025.