Qun Lin and Hehu Xie. (2018). A Type of Finite Element Gradient Recovery Method Based on Vertex-Edge-Face Interpolation: The Recovery Technique and Superconvergence Property.
            <i>East Asian Journal on Applied Mathematics</i>. <i>1</i> (3).
            248-263.
         doi:10.4208/eajam.251210.250411a