Nicola, Aurelian, and Constantin Popa. “Preconditioning by an Extended Matrix Technique for Convection-Diffusion-Reaction Equations”. Rev. Anal. Numér. Théor. Approx. 37, no. 2 (August 1, 2008): 181–190. Accessed July 24, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2008-vol37-no2-art10.