Wang Kong, Zhenying Hong, Guangwei Yuan & Zhiqiang Sheng. (2024). Monotonicity Corrections for Nine-Point Scheme of Diffusion Equations.
            <i>Journal of Computational Mathematics</i>. <i>42</i> (5).
            1305-1327.
         doi:10.4208/jcm.2303-m2022-0139