RedchukI. K. “Separating Functions, Spectral Theory of Graphs, and Locally Scalar Representations in Hilbert Spaces”. Ukrains’kyi Matematychnyi Zhurnal 58, no. 1 (January 25, 2006): 36–46. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3433.