VOLCHKOV, V. V. Uniqueness theorems for multiple lacunary trigonometric series. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 11, p. 1477–1481, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4799. Acesso em: 5 dec. 2025.