Han , YihuiLi , Hongliang and Xie , Xiaoping. (2019). Robust Globally Divergence-Free Weak Galerkin Finite Element Methods for Unsteady Natural Convection Problems.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>12</i> (4).
            1266-1308.
         doi:10.4208/nmtma.OA-2019-0069