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IEEE Systems Journal > 2011 > 5 > 1 > 6 - 15
IEEE Transactions on Engineering Management > 2011 > 58 > 4 > 674 - 687
IEEE Systems Journal > 2011 > 5 > 1 > 6 - 15
IEEE Transactions on Engineering Management > 2011 > 58 > 4 > 674 - 687