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3. Nolan, Janne E. “The Concept of Cooperative Security,” in Janne E. Nolan, ed.Global Engagement: Cooperation and Security in the 21st Century(Washington DC: The Brookings Institution 1994), p. 5.
4. Ashton B. Carter, William J. Perry, and John D. Stenbruner,A New Concept of Cooperative Security, Brookings Occasional Papers (Washington DC: The Brookings Institution, 1992), p. 6.