“Insights in Inspecting Two-Degree-of-Freedom of Mathieu-Cubic-Quintic Duffing Oscillator”.
European Journal of Pure and Applied Mathematics 18, no. 2 (May 1, 2025): 5662. Accessed December 5, 2025.
https://www.ejpam.com/index.php/ejpam/article/view/5662.