Albeverio, S., Yu. G. Kondratiev, and Yu. V. Kozitsky. “Quantum Hierarchical Model”. Methods of Functional Analysis and Topology 2, no. 3 (December 25, 1996): 1–35. Accessed December 19, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/17.