Emanuele Santos Lauro Didier Lins James P. Ahrens Juliana Freire Cláudio T. Silva A First Study on Clustering Collections of Workflow Graphs. 160-173 2008 IPAW http://dx.doi.org/10.1007/978-3-540-89965-5_18 conf/ipaw/2008 db/conf/ipaw/ipaw2008.html#SantosLAFS08