LIVINSKII, V. O. Essential normality of some classes of operators in infinite tensor products of Hilbert spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 9, p. 1164–1170, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5633. Acesso em: 5 dec. 2025.