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Perkovich, George, Malcolm Chalmers, Steven Pifer, Paul Schulte, and Jaclyn Tandler. Looking Beyond The Chicago Summit: Nuclear Weapons in Europe and the Future of NATO. Washington DC: Carnegie Endowment for International Peace, 2012.

Pifer, Steven. "Ukraine?s Geopolitical Choice, 2009." Eurasian Geography and Economics 50, no. 4 (2009): 387-401.