| The impact of complementarity on national implementation of substantive international criminal law JK Kleffner Journal of international criminal justice 1 (1), 86-113, 2003 | 281 | 2003 |
| Internationalized Criminal Courts and Tribunals: Sierra Leone, East Timor, Kosovo, and Cambodia CPR Romano, A Nollkaemper, JK Kleffner Oxford University Press, 2004 | 189 | 2004 |
| Complementarity in the Rome Statute and national criminal jurisdictions JK Kleffner OUP Oxford, 2008 | 179 | 2008 |
| The applicability of international humanitarian law to organized armed groups JK Kleffner International Review of the Red Cross 93 (882), 443-461, 2011 | 91 | 2011 |
| FROM ‘BELLIGERENTS’TO ‘FIGHTERS’AND CIVILIANS DIRECTLY PARTICIPATING IN HOSTILITIES–ON THE PRINCIPLE OF DISTINCTION IN NON-INTERNATIONAL ARMED CONFLICTS ONE HUNDRED YEARS AFTER … JK Kleffner Netherlands International Law Review 54 (2), 315-336, 2007 | 84 | 2007 |
| Jus post bellum: towards a law of transition from conflict to peace C Stahn, JK Kleffner TMC Asser Press, 2008 | 81 | 2008 |
| Scope of Application of Humanitarian Law J Kleffner Oxford University Press, 2021 | 70 | 2021 |
| The practice of shared responsibility in international law A Nollkaemper, I Plakokefalos, J Schechinger, JK Kleffner Cambridge University Press, 2017 | 43 | 2017 |
| Section IX of the ICRC Interpretive Guidance on Direct Participation in Hostilities: the end of jus in bello proportionality as we know it? JK Kleffner Israel Law Review 45 (1), 35-52, 2012 | 41 | 2012 |
| The politics of genocide justice in Cambodia C Etcheson, CPR Romano, A Nollkaemper, JK Kleffner Romano C and others (eds), Internationalized Criminal Courts and Tribunals …, 2004 | 35 | 2004 |
| The collective accountability of organized armed groups for system crimes JK Kleffner CambridgeCambridge University Press, 2009 | 33 | 2009 |
| Establishing an Individual Complaints Procedure for Violations of International Humanitarian Law1 JK Kleffner, L Zegveld Yearbook of International Humanitarian Law 3, 384-401, 2000 | 32 | 2000 |
| Human rights and international humanitarian law: General issues JK Kleffner Oxford University Press, 2010 | 29 | 2010 |
| Complementarity as a Catalyst for Compliance JK Kleffner TMC Asser Press, 2006 | 29 | 2006 |
| Complementary Views on Complementarity: Proceedings of the International Roundtable on the Complementary Nature of the International Criminal Court, Amsterdam 25/26 June 2004 JK Kleffner, G Kor TMC Asser Press, 2006 | 23 | 2006 |
| Soldier 2.0: military human enhancement and international law HA Harrison Dinniss, JK Kleffner Dehumanization of Warfare: Legal Implications of New Weapon Technologies …, 2018 | 21 | 2018 |
| A handbook on assisting international criminal investigations CA Nielsen, J Kleffner, M Nystedt Folke Bernadotte Academy, 2011 | 21 | 2011 |
| Towards a functional conceptualization of the temporal scope of jus post bellum JK Kleffner Oxford University Press, 2014 | 20 | 2014 |
| Protection of the wounded, sick, and shipwrecked J Kleffner Oxford University Press, 2021 | 18 | 2021 |
| Improving compliance with international humanitarian law through the establishment of an individual complaints procedure JK Kleffner Leiden journal of international law 15 (1), 237-250, 2002 | 17 | 2002 |
