Germán Creamer Ryan Rowe Shlomo Hershkop Salvatore J. Stolfo Segmentation and Automated Social Hierarchy Detection through Email Network Analysis. 40-58 2007 WebKDD/SNA-KDD http://dx.doi.org/10.1007/978-3-642-00528-2_3 conf/kdd/2007web db/conf/kdd/webkdd2007.html#CreamerRHS07