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Tagarev, Todor, Raphael Perl, and Valeri Ratchev. "Recommendations and Courses of Action: How to Secure the Post-Covid Future." In Transatlantic Security: Securing the Post Covid Future, 18-41. Vienna, Austria: Federal Ministry of Defense, 2020.
Perl, Raphael. Combating Terrorism: The Challenge of Measuring Effectiveness. Washington, D.C.: Congressional Research Service, 2005.