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Source:
Systems Engineering. Dec2011, Vol. 14 Issue 4, p441-454. 14p. 1 Diagram, 1 Chart, 9 Graphs.
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Source:
Information Knowledge Systems Management. 2011, Vol. 10 Issue 1-4, p25-49. 25p. 4 Diagrams, 4 Charts, 1 Graph.
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