| Differentiated integration: Explaining variation in the European Union D Leuffen, B Rittberger, F Schimmelfennig Palgrave Macmillan, 2013 | 787 | 2013 |
| The European Union as a system of differentiated integration: interdependence, politicization and differentiation F Schimmelfennig, D Leuffen, B Rittberger Journal of European public policy 22 (6), 764-782, 2015 | 457 | 2015 |
| A new dataset on decision-making in the European Union before and after the 2004 and 2007 enlargements (DEUII) R Thomson, J Arregui, D Leuffen, R Costello, J Cross, R Hertz, T Jensen Journal of European Public Policy 19 (4), 604-622, 2012 | 174 | 2012 |
| Analysing European Union decision-making during the Eurozone crisis with new data F Wasserfallen, D Leuffen, Z Kudrna, H Degner European Union Politics 20 (1), 3-23, 2019 | 122 | 2019 |
| Too big to run? Analysing the impact of enlargement on the speed of EU decision-making R Hertz, D Leuffen European Union Politics 12 (2), 193-215, 2011 | 97 | 2011 |
| Integration and differentiation in the European Union: Theory and policies D Leuffen, B Rittberger, F Schimmelfennig Springer Nature, 2022 | 87 | 2022 |
| Enhanced cooperation in practice. An analysis of differentiated integration in EU secondary law DA Kroll, D Leuffen Journal of European Public Policy 22 (3), 353-373, 2015 | 85 | 2015 |
| Explaining governmental preferences on economic and monetary union reform S Târlea, S Bailer, H Degner, LM Dellmuth, D Leuffen, M Lundgren, ... European Union Politics 20 (1), 24-44, 2019 | 70 | 2019 |
| Franco-German cooperation and the rescuing of the Eurozone H Degner, D Leuffen European Union Politics 20 (1), 89-108, 2019 | 69 | 2019 |
| Case selection and selection bias in small-n research D Leuffen Research design in political science: How to practice what they preach, 145-160, 2007 | 67 | 2007 |
| Ties that bind, can also strangle: the Brexit threat and the hardships of reforming the EU DA Kroll, D Leuffen Journal of European Public Policy 23 (9), 1311-1320, 2016 | 59 | 2016 |
| Differentiated integration of core state powers B Rittberger, D Leuffen, F Schimmelfennig Beyond the regulatory polity, 189-210, 2013 | 57 | 2013 |
| If things can only get worse: Anticipation of enlargement in European Union legislative politics D Leuffen, R Hertz European Journal of Political Research 49 (1), 53-74, 2010 | 54 | 2010 |
| Measurement and Data Aggregation in Small-n Social Scientific Research D Leuffen, S Shikano, S Walter European Political Science 12, 40-51, 2013 | 48 | 2013 |
| Forschungsdesign in der Politikwissenschaft: Probleme-Strategien-Anwendungen T Gschwend, F Schimmelfennig Campus Verlag, 2007 | 47 | 2007 |
| Differentiated integration in the European Union: Institutional effects, public opinion, and alternative flexibility arrangements F Schimmelfennig, D Leuffen, CE De Vries European Union Politics 24 (1), 3-20, 2023 | 46 | 2023 |
| Divided we stand–unified we govern? Cohabitation and regime voting in the 2002 French elections T Gschwend, D Leuffen British Journal of Political Science 35 (4), 691-712, 2005 | 46 | 2005 |
| Fallauswahl in der qualitativen Sozialforschung D Leuffen | 45 | 2007 |
| Crises and responsiveness: Analysing German preference formation during the eurozone crisis H Degner, D Leuffen Political Studies Review 18 (4), 491-506, 2020 | 41 | 2020 |
| Keynes, Friedman, or Monnet? Explaining parliamentary voting behaviour on fiscal aid for euro area member states H Degner, D Leuffen West European Politics 39 (6), 1139-1159, 2016 | 41 | 2016 |
