Huang , RuihaoSun , Jiguang and Yang , Chao. (2020). A Multilevel Spectral Indicator Method for Eigenvalues of Large Non-Hermitian Matrices.
            <i>CSIAM Transactions on Applied Mathematics</i>. <i>1</i> (3).
            463-477.
         doi:10.4208/csiam-am.2020-0021