Chen , YuanHou , Songming and Zhang , Xu. (2019). An Immersed Finite Element Method for Elliptic Interface Problems with Multi-Domain and Triple Junction Points.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>11</i> (5).
            1005-1021.
         doi:10.4208/aamm.OA-2018-0175