VAKARCHUK, S. B.; SHABOZOV, M. Sh. On exact values of quasiwidths of some classes of functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 3, p. 301–308, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5327. Acesso em: 5 dec. 2025.