An Iterative Fractional Operational Matrix Method for Solving Fractional Undamped Duffing Equation with High Nonlinearity. Eur. J. Pure Appl. Math. [Internet]. 2025 May 1 [cited 2025 Dec. 5];18(2):5884. Available from: https://www.ejpam.com/index.php/ejpam/article/view/5884