BART, V. A.; KHAVIN, V. P. Szego-Kolmogorov-Krein theorems on weighted trigonometrical approximation and Carleman-type relations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 1-2, p. 100–127, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5773. Acesso em: 6 dec. 2025.