Fil , B. N., A. K. Prikarpatsky, and N. N. Pritula. “Quantum Lee Algebra of Currents Is a Universal Algebraic Structure of Symmetries of Quite Integrable Dynamic Systems”. Ukrains’kyi Matematychnyi Zhurnal 40, no. 6 (November 1, 1988): 764–768. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/9287.