ROMANYUK, V. S. Weighted approximation in mean of classes of analytic functions by algebraic polynomials and finite-dimensional subspaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 5, p. 645–662, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4651. Acesso em: 6 dec. 2025.