VAKARCHUK, S. B.; DORONIN, V. G. Best mean square approximations by entire functions of finite degree on a straight line and exact values of mean widths of functional classes. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 8, p. 1032–1043, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2935. Acesso em: 5 dec. 2025.