Gong , YunjieChen , ChuanjunLou , Yuzhi and Xue , Guanyu. (2021). Crank-Nicolson Method of a Two-Grid Finite Volume Element Algorithm for Nonlinear Parabolic Equations.
            <i>East Asian Journal on Applied Mathematics</i>. <i>11</i> (3).
            540-559.
         doi:10.4208/eajam.090820.311220