@article{PhysRevLett.100.118703, author = {Leicht, E. A. and Newman, M. E. J.}, doi = {10.1103/PhysRevLett.100.118703}, interhash = {825411a28bde71cda1c9087fc329d963}, intrahash = {93726cc0540f75ee1cb515b2923d69e8}, journal = {Phys. Rev. Lett.}, month = mar, number = 11, numpages = {4}, pages = 118703, publisher = {American Physical Society}, title = {Community Structure in Directed Networks}, url = {http://prl.aps.org/abstract/PRL/v100/i11/e118703}, volume = 100, year = 2008 }