LopotkoO. V. “Representations of the Additive Group of a Nuclear Space in Terms of Self-Adjoint Operators”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 2 (February 25, 1999): 271–274. Accessed November 28, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4609.