VAKARCHUK, S. B. Best mean-square approximation of functions defined on the real axis by entire functions of exponential type. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 5, p. 604–615, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2601. Acesso em: 5 dec. 2025.