Yuping Zeng, Feng Wang, Zhifeng Weng & Hanzhang Hu. (2021). A Posteriori Error Estimates for a Modified Weak Galerkin Finite Element Approximation of Second Order Elliptic Problems with DG Norm.
            <i>Journal of Computational Mathematics</i>. <i>39</i> (5).
            755-776.
         doi:10.4208/jcm.2006-m2019-0010