KRAVCHUK, N. V. On connection of states of the von Neumann algebras . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 40, n. 5, p. 640–642, 1988. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8815. Acesso em: 5 dec. 2025.