John C. Urschel, Jinchao Xu, Xiaozhe Hu & Ludmil T. Zikatanov. (2020). A Cascadic Multigrid Algorithm for Computing the Fiedler Vector of Graph Laplacians.
            <i>Journal of Computational Mathematics</i>. <i>33</i> (2).
            209-226.
         doi:10.4208/jcm.1412-m2014-0041