Nessonov, N. I., and M. Boyko. “Entropy of Bogoliubov Automorphisms on II$_1$-Representations of the Group $U(\infty)$”. Methods of Functional Analysis and Topology 9, no. 4 (December 25, 2003): 317–332. Accessed December 17, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/225.