STRILETS, O. On some properties of the Gram operator. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 77, n. 3, p. 214–227, 2025. DOI: 10.3842/umzh.v77i3.8685. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8685. Acesso em: 5 dec. 2025.