F. Qasem A, احمد. Numerical Solution for Linear Parabolic Reaction-Double Diffusivity System using the Operational Matrices of the Haar Wavelets Method. RJCSM [Internet]. 2025 Jun. 25 [cited 2025 Aug. 5];5(1):177-95. Available from: https://rjps.uomosul.edu.iq/index.php/csmj/article/view/20064