VYNNYTS’KYI, B. V. Approximation properties of systems of exponentials in one space of analytic functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 2, p. 168–183, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5345. Acesso em: 5 dec. 2025.