STEPANETS, O. I. Approximations in spaces of locally integrable functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 5, p. 597–625, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5722. Acesso em: 11 apr. 2025.