T. Chopin and C. Lequesne, Disintegration Reversed: Brexit and the Cohesiveness of the EU27, Journal of Contemporary European Studies, 2020.

M. Cini and A. Verdun, The Implications of Brexit for the Future of Europe, Brexit and Beyond. Rethinking the Futures of Europe, pp.63-71, 2018.

V. J. D'erman, Comparative Intergovernmental Politics. CETA Negotiations between Canada and the EU, Politics and Governance, vol.4, issue.3, pp.90-99, 2016.

M. Egeberg and J. Trondal, Differentiated Integration in Europe: The Case of EEA Country, Norway, Journal of Common Market Studies, vol.37, issue.1, pp.133-142, 1999.

A. Eisl, E. Fabry, and ;. , Is Brexit a Game Changer for EU External Differentiated Integration?, in Andreas Aktoudianakis, pp.67-71, 2020.

, Recommendation for a Council Decision Authorising the Opening of Negotiations for a New Partnership with the United Kingdom of Great Britain and Northern Ireland, COM, European Commission (2020a), pp.52020-52055, 2020.

, Trade Agreements: Geography and Trade Intensity, 2020.

, Accord facilitant les relations bilatérales entre l'Union européenne et la Confédération Suisse dans les parties du marché intérieur auxquelles la Suisse participe, Framework Agreement, 2018.

M. Frenkel and B. Walter, The EU-Japan Economic Partnership Agreement: Relevance, Content and Policy Implications, in Intereconomics, vol.52, issue.6, pp.358-363, 2017.

C. Frommelt, Search of Effective Differentiated Integration: Lessons from the European Economic Area (EEA), 2017.

, EU IDEA Policy Briefs, issue.1

S. Gstöhl and C. Frommelt, Back to the Future? Lessons of Differentiated Integration from the EFTA Countries for the UK's Future Relations with the EU, Social Sciences, vol.6, issue.4, 2017.

F. Hakura, EU-Turkey Customs Union. Prospects for Modernization and Lessons for Brexit, Chatham House Briefings, 2018.

K. Hayward and D. Phinnemore, An EU Presence in Northern Ireland after Brexit, UK in a Changing Europe Explainers, 2020.

S. Jenni, Switzerland's Regulatory European Integration: Between Tacit Consensus and Noisy Dissensus, Swiss Political Science Review, vol.21, issue.4, pp.508-537, 2015.

J. Kane, The UK's Different Approaches to US and EU Trade Negotiations Will Not Help Either Cause, 2020.

C. Karakas, EU-Turkey: Integration without Full Membership or Membership without Full Integration? A Conceptual Framework for Accession Alternatives, Journal of Common Market Studies, vol.51, issue.6, pp.1057-1073, 2013.

B. Leruth, S. Gänzle, and J. Trondal, Exploring Differentiated Disintegration in a Post-Brexit European Union, Journal of Common Market Studies, vol.57, issue.5, pp.1013-1030, 2019.

S. Lowe, The Future EU-UK Relationship and the (Relative) Case for Optimism, CER Insights, 2020.

M. Müftüler-baç, Turkey's Future with the European Union: An Alternative Model of Differentiated Integration, Turkish Studies, vol.18, pp.416-438, 2017.

, Western Balkan Economies in Transition. Recent Economic and Social Developments, 2019.

D. Raess, Level Playing Field Rules and Labour Protection, UK in a Changing Europe Analyses, 2020.

F. Schimmelfennig, Switzerland's Differentiated European Integration: What Can We Learn from the Study of Europeanization?, Swiss Political Science Review, vol.20, issue.2, pp.255-258, 2014.

F. Schimmelfennig, Brexit: Differentiated Disintegration in the European Union, Journal of European Public Policy, vol.25, issue.8, pp.1154-1173, 2018.

, Political Declaration Setting Out the framework for the Future Relationship bewteen the European Union and the United Kingdom, 2018.

. Uk-government, The Future Relationship with the EU. The UK's Approach to Negotiations, 2020.

M. Vahl and N. Grolimund, Integration without Membership, 2006.

, Switzerland's Bilateral Agreements with the European Union, Brussels, Centre for European Policy Studies

. Van-der-loo, ;. Guillaume, M. Arnoud, and . Kamau, The EU-Ukraine Association Agreement and Deep and Comprehensive Free Trade Area. A New Legal Instrument for EU Integration without Membership, International Trade Law & Regulation, vol.25, pp.75-91, 2016.