Urschel , John C.Xu , JinchaoHu , Xiaozhe and Zikatanov , Ludmil T.. (2015). A Cascadic Multigrid Algorithm for Computing the Fiedler Vector of Graph Laplacians. Journal of Computational Mathematics. 33 (2). 209-226. doi:10.4208/jcm.1412-m2014-0041