DILNYI, V. M. On Completeness of a System of Functions in an Angular Domain. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 2, p. 255–257, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4242. Acesso em: 14 apr. 2025.