[1]
V. L. Kulik and N. V. Stepanenko, “Alternating Lyapunov functions in the theory of linear extensions of dynamical systems on a torus”, Ukr. Mat. Zhurn., vol. 59, no. 4, pp. 488–500, Apr. 2007, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3323