Haizheng Zhang Wei Li Xuerui Wang C. Lee Giles Henry C. Foley John Yen HSN-PAM: Finding Hierarchical Probabilistic Groups from Large-Scale Networks. 27-32 2007 ICDM Workshops http://doi.ieeecomputersociety.org/10.1109/ICDMW.2007.55 conf/icdm/2007w db/conf/icdm/icdmw2007.html#ZhangLWGFY07