Jeremy Kubica Andrew W. Moore Jeff G. Schneider Tractable Group Detection on Large Link Data Sets. 573-576 2003 conf/icdm/2003 ICDM http://csdl.computer.org/comp/proceedings/icdm/2003/1978/00/19780573abs.htm db/conf/icdm/icdm2003.html#KubicaMS03