F. Qasem, Ahmed, and احمد. “Numerical Solution for Linear Parabolic Reaction-Double Diffusivity System Using the Operational Matrices of the Haar Wavelets Method”. AL-Rafidain Journal of Computer Sciences and Mathematics 5, no. 1 (June 25, 2025): 177–195. Accessed September 8, 2025. https://tanmiyat.uomosul.edu.iq/index.php/csmj/article/view/37101.