Lerina Aversano Gerardo Canfora Luigi Cerulo Concettina Del Grosso Massimiliano Di Penta An empirical study on the evolution of design patterns. 385-394 2007 conf/sigsoft/2007 ESEC/SIGSOFT FSE http://doi.acm.org/10.1145/1287624.1287680 db/conf/sigsoft/fse2007.html#AversanoCCGP07