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Tagarev, Todor, Raphael Perl, and Valeri Ratchev. "\i Recommendations and Courses of Action: How to Secure the Post-Covid Future\i0 ." In \i Transatlantic Security: Securing the Post Covid Future\i0 , 18-41. Vienna, Austria: Federal Ministry of Defense, 2020.\par \par Perl, Raphael, and Nemanja Malisevic. "\i A Comprehensive Approach to Cyber Security ?Trends,  Challenges and the Way Forward\i0 ." In \i The Dangerous Landscape\i0 , 47-61., 2013.\par \par Perl, Raphael. "Enhancing Diplomatic Effectiveness: A Common-Sense Risk Management Approach to Counter-terrorism." \i Connections: The Quarterly Journal\i0  8, no. 4 (2009): 99-107.\par \par Perl, Raphael. "Combating Extremist Ideologies: Measuring Effectiveness-Considerations for Public Diplomacy." \i Connections: The Quarterly Journal\i0  5, no. 4 (2006): 64-72.\par \par Perl, Raphael. \i Terrorism and National Security: Issues and Trends\i0 . Washington, D.C.: Congressional Research Service, 2006.\par \par Perl, Raphael. \i Combating Terrorism: The Challenge of Measuring Effectiveness\i0 . Washington, D.C.: Congressional Research Service, 2005.\par \par }