V. A. Tesko and Y. M. Berezansky, “The investigation of Bogoliubov functionals by operator methods of moment problem”, MFAT, vol. 22, no. 1, pp. 1–47, Mar. 2016, Accessed: Dec. 16, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/625