PrykarpatskyA. K., SamoilenkoV. G., & TaneriU. (2003). The Reduction Method in the Theory of Lie-Algebraically Integrable Oscillatory Hamiltonian Systems. Ukrains’kyi Matematychnyi Zhurnal, 55(2), 232-240. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3901