YingxiaXi, XiaJi & ShuoZhang. (2021). Order Reduced Schemes for the Fourth Order Eigenvalue Problems on Multi-Connected Planar Domains.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>14</i> (4).
            920-944.
         doi:10.4208/nmtma.OA-2021-0046