Haijun Wu & Weiying Zheng. (2023). Uniform Convergence of Multigrid V-Cycle on Adaptively Refined Finite Element Meshes for Elliptic Problems with Discontinuous Coefficients.
            <i>Communications in Mathematical Research </i>. <i>39</i> (3).
            437-475.
         doi:10.4208/cmr.2022-0047