Jay Kothari Ali Shokoufandeh Spiros Mancoridis Ahmed E. Hassan Studying the Evolution of Software Systems Using Change Clusters. 46-55 2006 conf/iwpc/2006 ICPC http://doi.ieeecomputersociety.org/10.1109/ICPC.2006.44 db/conf/iwpc/icpc2006.html#KothariSMH06