Xu , XiuxiuHuang , Qiumei and Chen , Hongtao. (2016). Local Superconvergence of Continuous Galerkin Solutions for Delay Differential Equations of Pantograph Type.
            <i>Journal of Computational Mathematics</i>. <i>34</i> (2).
            186-199.
         doi:10.4208/jcm.1511-m2014-0216