Albeverio, S., V. D. Koshmanenko, and G. M. Torbin. “Fine Structure of the Singular Continuous Spectrum”. Methods of Functional Analysis and Topology 9, no. 2 (June 25, 2003): 101–119. Accessed December 17, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/206.