N. V. . Kravchuk, “On connection of states of the von Neumann algebras ”, Ukr. Mat. Zhurn., vol. 40, no. 5, pp. 640–642, Aug. 1988, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8815