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2015. Is ISIS a Revolutionary Group and if Yes, What Are the Implications? Perspectives on Terrorism, 2015, 9:4, 42-47
2015. How Civil Wars Help Explain Organized Crime–And How They Do Not. Journal of Conflict Resolution, 2015, 59:8, 1517-1540
2015. Militias in Civil Wars: An Emerging Research Agenda. With Corinna Jentzsch & Livia I. Schubiger. Journal of Conflict Resolution, 2015, 59:5, 755-769
2015. Rebel Governance in the Greek Civil War. In Ana Arjona, Nelson Kasfir & Zachariah Mampilly (eds.), Rebel Governance in Civil War. New York: Cambridge University Press, 2015, 119-137
2014. Does Warfare Matter? Severity, Duration, and Outcomes of Civil Wars (with Laia Balcells). Journal of Conflict Resolution, 2014, 58:8, 1390- 1418
2012. Microlevel Studies of Violence in Civil War: Refining and Extending the Control-Collaboration Model. Terrorism and Political Violence, 2012, 24:4, 658-668
2012. The “Turkish Model” in the Matrix of Political Catholicism. In Ahmet T. Kuru and Alfred Stepan (eds), Democracy, Islam, and Secularism in Turkey. New York: Columbia University Press, 2012, 187-198
2011. Recruitment into Armed Groups in Colombia: A Survey of Demobilized Fighters. In Yvan Guichaoua (ed.), Mobilizing for Violence: Armed Groups and Their Combatants. Palgrave-Macmillan, (with Ana M. Arjona)
2011. Aerial Bombing and Counterinsurgency in the Vietnam War. American Journal of Political Science, 55:2, 1-18 (with Mathew Kocher and Tom Pepinsky)
2011. The Changing Character of Civil Wars, 1800-2009. In Hew Strachan and Sibylle Scheipers (eds.), The Changing Character of War. Oxford: Oxford University Press, forthcoming
2010. International System and Technologies of Rebellion: How the End of the Cold War Shaped Internal Conflict. American Political Science Review 104:3, 415-429 (with Laia Balcells)
2010. Christian Democracy. Annual Reviews of Political Science 13: 183-209 (with Kees van Kersbergen)
2009. Civil Wars . In Robert A. Denemark (ed.), The International Study Association Compedium Project. Oxford: Blackwell (with Paul Kenny)
2009. Conflict and the Explanation of Action. In Peter Hedstrom (ed.), Oxford Handbook of Analytical Sociology
2009. The Dynamics of Violence in the Vietnam War: An Analysis of the Hamlet Evaluation System (HES), Journal of Peace Research, 2009, 46:3, 335-355 (with Matt Kocher)
2008. Ethnic Defection in Civil War. Comparative Political Studies, 41:8, 1043-1068
2008. Fear, Preemption, Retaliation: An Empirical Test of the Security Dilemma. In Stephen M. Seideman and Marie- Joëlle Zahar (eds.), Insecurity in Intra-State Conflicts: Governments, Rebels, and Outsiders. New York: Routledge, 20-32
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2008. Collaboration in Comparative Perspective. European Review of History, 15:2, 109-111
2008. Armed Collaboration in Greece, 1941-1944. European Review of History, 15:2, 129-142
2008. How Not To Compare Civil Wars: Greece and Spain. In Martin Baumeister & Stefanie Schüler-Springorum (eds.), “If You Tolerate This…” The Spanish Civil War in the Age of Total War. Frankfurt and New York: Campus Verlag, 247-263
2007. How Free is “Free Riding” in Civil Wars? Violence, Insurgency, and the Collective Action Problem. World Politics, 59:2, 177-216 (with Matt Kocher)
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2007. Ethnic Cleavages and Irregular War: Iraq and Vietnam. Politics and Society, 35:2, 183-223
2005. Bosnia’s Civil War: Origins and Violence Dynamics. In Paul Collier and Nicholas Sambanis (eds), Understanding Civil War: Evidence and Analysis, Washington, DC: The World Bank, Volume 2, 191-229 (with Nicholas Sambanis)
2005. Killing Without Dying: The Absence of Suicide as_Missions. In Diego Gambetta(ed.), Making Sense of Suicide Missions.Oxford: Oxford University Press, 209-232 (with Ignacio Sanchez Cuenca)
2005. Warfare in Civil Wars. In Isabelle Duyvesteyn and Jan Angstrom (eds.), Rethinking the Nature of War. Abingdton: Frank Cass, 88-108
2004. The Urban Bias in Research on Civil Wars. Security Studies 13:3, 1-31
2004. The Paradox of Terrorism in Civil War. Journal of Ethics 8:1, 97-138
2003. The Ontology of “Political Violence:” Action and Identity in Civil Wars. Perspectives on Politics 1:3, 475-494
2003. Unsecular politics and religious mobilization. In Thomas A.Kselman and Joseph Buttigieg (eds.), European Christian Democracy: Historical Legacies and Comparative Perspectives. Notre Dame: Notre Dame University Press, 293-320
2002. Greek Communism, 1968-2001. Eastern European Politics and Societies, 16:3, 665-690 (with Nikos Marantzidis)
2001. “New” and “Old” Civil Wars: A Valid Distinction? World Politics 54:1, 99-118
2000. Commitment Problems in Emerging Democracies: The Case of Religious Parties. Comparative Politics 32:4, 379-399
2000. Red Terror – Leftist Violence During the Occupation. In Mark Mazower After the War was Over: Reconstructing Family, State, and Nation in Greece, 1944-1960. Princeton: Princeton University Press, 142-183
1999. Wanton and Senseless? The Logic of Massacres in Algeria. Rationality and Society 11:3, 243-285
1999. The Decay and Breakdown of Communist One-Party Systems. Annual Review of Political Science 2, 323-43
1998. Democracy and Religious Politics: Evidence from Belgium. Comparative Political Studies 31:3, 291-319
1998. From Pulpit to Party: Party Formation and the Christian Democratic Phenomenon. Comparative Politics 30:3, 293-312
1998. The Right in Greece: Between Transition and Reform. In Frank L. Wilson (ed.), The European Center-Right at the Turn of the Century.New York: St. Martin’s Press, 87-115
1997. Polarization in Greek Politics: PASOK’s First Four Years, 1981-1985. Journal of the Hellenic Diaspora 23:1, 83-104
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