Liao , Hong-linTang , Tao and Zhou , Tao. (2023). Discrete Energy Analysis of the Third-Order Variable-Step BDF Time-Stepping for Diffusion Equations.
            <i>Journal of Computational Mathematics</i>. <i>41</i> (2).
            325-344.
         doi:10.4208/jcm.2207-m2022-0020