Fuesheng Luo, Tao Tang and Hehu Xie. (2018). Parameter-Free Time Adaptivity Based on Energy Evolution for the Cahn-Hilliard Equation.
            <i>Communications in Computational Physics</i>. <i>19</i> (5).
            1542-1563.
         doi:10.4208/cicp.scpde14.45s