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Global Journal of Flexible Systems Management > 2008 > 9 > 4 > 21-31
IEEE Systems Journal > 2008 > 2 > 4 > 484 - 499
Global Journal of Flexible Systems Management > 2008 > 9 > 4 > 21-31
IEEE Systems Journal > 2008 > 2 > 4 > 484 - 499