Olivier Verscheure Michail Vlachos Aris Anagnostopoulos Pascal Frossard Eric Bouillet Philip S. Yu Finding "Who Is Talking to Whom" in VoIP Networks via Progressive Stream Clustering. 667-677 2006 conf/icdm/2006 ICDM http://doi.ieeecomputersociety.org/10.1109/ICDM.2006.72 db/conf/icdm/icdm2006.html#VerscheureVAFBY06