Francesco Bonchi Pooya Esfandiar David F. Gleich Chen Greif Laks V. S. Lakshmanan Fast Matrix Computations for Pairwise and Columnwise Commute Times and Katz Scores. 73-112 2012 8 Internet Mathematics 1-2 http://dx.doi.org/10.1080/15427951.2012.625256 db/journals/im/im8.html#BonchiEGGL12