Yuzhi Lou, Chuanjun Chen & Guanyu Xue. (1970). Two-Grid Finite Volume Element Method Combined with Crank-Nicolson Scheme for Semilinear Parabolic Equations.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>13</i> (4).
            892-913.
         doi:10.4208/aamm.OA-2020-0064