physics/0605087 [abs, ps, pdf, other] : Title: Finding community structure in networks using the eigenvectors of matrices Authors: M. E. J. Newman Comments: 22 pages, 8 figures, minor corrections in this version Subj-class: Data Analysis, Statistics and Probability; Physics and Society; Statistical Mechanics Journal-ref: Phys. Rev. E 74, 036104 (2006)