F. Qasem A. Numerical Solution for Linear Parabolic Reaction-Double Diffusivity System using the Operational Matrices of the Haar Wavelets Method. RJCSM [Internet]. 2008 Jun. 5 [cited 2025 Dec. 17];5(1):177-95. Available from: https://csmj.uomosul.edu.iq/index.php/csmj/article/view/37101