Jeffrey Baumes Mark K. Goldberg Mykola Hayvanovych Malik Magdon-Ismail William A. Wallace Mohammed Javeed Zaki Finding Hidden Group Structure in a Stream of Communications. 201-212 2006 conf/isi/2006 ISI http://dx.doi.org/10.1007/11760146_18 db/conf/isi/isi2006.html#BaumesGHMWZ06