BONDAR , A. V.; ROMANENKO , V. Yu. Some conditions of holomorphism in the Hilbert spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 43, n. 1, p. 35–40, 1991. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9302. Acesso em: 6 dec. 2025.