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IEEE Transactions on Services Computing > 2009 > 2 > 1 > 3 - 16
IEEE Transactions on Services Computing > 2008 > 1 > 4 > 187 - 200
IEEE Transactions on Software Engineering > 2007 > 33 > 3 > 186 - 197
Future Generation Computer Systems > 2003 > 19 > 2 > 313-326