V. G. Samoilenko and B. N. . Fil, “Algebras of symmetries of completely integrable dynamic systems”, Ukr. Mat. Zhurn., vol. 40, no. 2, pp. 192–198, Feb. 1988, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/9115