Wang , Cheng and Sun , Pengtao. (2021). An Augmented Lagrangian Uzawa Iterative Method for Solving Double Saddle-Point Systems with Semidefinite (2,2) Block and Its Application to DLM/FD Method for Elliptic Interface Problems.
            <i>Communications in Computational Physics</i>. <i>30</i> (1).
            124-143.
         doi:10.4208/cicp.OA-2020-0084