Xian-Ming Gu, Yanpu Zhao, Tingzhu Huang & Ran Zhao. (2020). Efficient Preconditioned Iterative Linear Solvers for 3-D Magnetostatic Problems Using Edge Elements.
            <i>Advances in Applied Mathematics and Mechanics</i>. <i>12</i> (2).
            301-318.
         doi:10.4208/aamm.OA-2018-0207