Hussien, Hasnaa Fiesal Mohammed, and Osama Hammed Mohammed. “Towards Solving Fractional Order Delay Variational Problems Using Euler Polynomial Operational Matrices”. Iraqi Journal of Science 64, no. 9 (September 30, 2023): 4693–4703. Accessed December 17, 2025. https://www.ijs.uobaghdad.edu.iq/index.php/eijs/article/view/9165.