Lytvynov, E. W., T. Kuna, Yu. G. Kondratiev, and Yu. M. Berezansky. “On a Spectral Representation for Correlation Measures in Configuration Space Analysis”. Methods of Functional Analysis and Topology 5, no. 4 (December 25, 1999): 87–100. Accessed December 17, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/109.