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Center for European and International Law

Organisational unit: Institute

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Organisation profile

The directors of the Leuphana Center for European and International Law (CEIL) conduct research on fundamental issues of European and international law. The research focuses on questions of securing constitutional structures based on the rule of law at the European and international level as well as on fundamental questions of legitimacy and structure of European and international economic law. Another focus is on European and international sustainability law as well as on dispute resolution at the European and international level.

In the Center for European and International Law, scholars from the School of Sustainability (Prof. Dr. Jelena Bäumler & Prof. Dr. Valentin Schatz) and the School of Public Affairs (Prof. Dr. Till Patrik Holterhus, Prof. Dr. Suzan Denise Hüttemann, Prof. Dr. Christian J. Tams, Prof. Dr. Jörg Philipp Terhechte) conduct joint research.

Main research areas

Listed below are publications that exemplify the work produced by the members of CEIL. A comprehensive list of publications by the members of the Centre can be found on the websites of the respective individuals and via the research database FOX of the Leuphana University of Lüneburg.

European Law

In the area of European law, the research focuses on Union constitutional and administrative law, cooperation in criminal law and EU economic law. Here, fundamental questions of the constitutionality of the EU are dealt with as well as current questions of economic law, whereby the connection to sustainability law and the role of the EU as a global actor are of particular importance.

International Law

Research on international law covers the central areas of the law of the international community. This includes questions of international maritime law, global environmental law and legal aid law as well as the foundations of the international legal order (state responsibility, sources of law). The academic work in these fields is application-oriented; it benefits from close cooperation with legal practitioners in governments, international organisations, NGOs and the legal profession.

International Business Law

In the field of international economic law, the focus is on research projects on WTO law and investment protection law. The directors of CEIL have a wide range of experience in the practical examination of the respective topics and have assumed numerous functions in international legal disputes in this context.

European and International Sustainability Law

Research on European and international sustainability law examines the individual legal levels and their interaction from the perspective of sustainability. Based on the UN Sustainable Development Goals and the European Green Deal, the role and transformation potential of law for central challenges of the present, such as climate change, biodiversity loss or environmental pollution, are examined.

Dispute Resolution

The peaceful settlement of international conflicts is the focus of many of CEIL's research projects. In close cooperation with international institutions (international tribunals, arbitration courts), the diverse regimes of international dispute resolution are researched. In addition to their academic work, directors of CEIL regularly participate in international (arbitration) court proceedings, for example as experts or legal advisors.

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  1. 2025
  2. Published

    European Yearbook of International Economic Law 2024

    Bäumler, J. (Editor), Binder, C. (Editor), Bungenberg, M. (Editor), Krajewski, M. (Editor), Rühl, G. (Editor), Tams, C. J. (Editor), Terhechte, J. (Editor) & Ziegler, A. R. (Editor), 10.06.2025, Cham: Springer Science and Business Media Deutschland. 448 p. (European Yearbook of International Economic Law; vol. 11)

    Research output: Books and anthologies › Collected editions and anthologies › Research

  3. Published

    The League of Nations as an international organisation

    Burton, P. & Tams, C. J., 05.2025, The Cambridge History of International Law: Volume 10: International Law at the Time of the League of Nations (1920–1945). Lesaffer, R., Kolb, R. & Milanov, M. (eds.). Cambridge: Cambridge University Press, p. 100-129 30 p. (The Cambridge History of International Law; vol. 10).

    Research output: Contributions to collected editions/works › Chapter › peer-review

  4. Published

    Public Interest Litigation avant la lettre? Questions of Standing in the Wimbledon Case

    Tams, C. J., 20.02.2025, The Legacy of the Wimbledon Case : Centenary of the First Judgment of the Permanent Court of International Justice . Kwiecien, R. & Fitzmaurice, M. (eds.). Brill | Nijhoff, p. 47-69 23 p. (Queen Mary Studies in International Law; vol. 57).

    Research output: Contributions to collected editions/works › Chapter › peer-review

  5. Published

    Responsabilidade Internacional Dos Estados: duas décadas após os trabalhos da Comissão de Direito Internacional

    Tams, C. J., 2025, Editora D'Plácido. 250 p.

    Research output: Books and anthologies › Book

  6. 2024
  7. Published

    European Yearbook of International Economic Law 2023

    Bäumler, J. (Editor), Binder, C. (Editor), Bungenberg, M. (Editor), Krajewski, M. (Editor), Rühl, G. (Editor), Tams, C. J. (Editor), Terhechte, J. (Editor) & Ziegler, A. R. (Editor), 17.10.2024, Cham: Springer International Publishing. 489 p. (European Yearbook of International Economic Law; vol. 14)

    Research output: Books and anthologies › Collected editions and anthologies › Research

  8. Published

    Article 2 (4)

    Tams, C., 30.05.2024, The Charter of the United Nations: A Commentary. Simma, B., Khan, D.-E., Nolte, G. & Paulus, A. (eds.). 4. Edition ed. Cambridge University Press, p. 289-366 78 p.

    Research output: Contributions to collected editions/works › Chapter

  9. Published

    Article 5

    Tams, C., 30.05.2024, The Charter of the United Nations: A Commentary. Simma, B., Khan, D.-E., Nolte, G. & Paulus, A. (eds.). 4. Edition ed. Oxford University Press, p. 523-540 18 p.

    Research output: Contributions to collected editions/works › Chapter

  10. Published

    Article 6

    Tams, C., 30.05.2024, The Charter of the United Nations: A Commentary. Simma, B., Khan, D.-E., Nolte, G. & Paulus, A. (eds.). 4. Edition ed. Cambridge University Press, p. 541-554 14 p.

    Research output: Contributions to collected editions/works › Chapter

  11. Published

    The International Court of Justice

    Tams, C. J., 16.05.2024, International Law. Evans, M. (ed.). 6. Edition ed. Oxford University Press, p. 555-591 37 p.

    Research output: Contributions to collected editions/works › Chapter

  12. Published

    Die E-Evidence-Verordnung: Pioniermodell für das digitale Zeitalter oder Preisgabe der Staatlichkeit?

    Hüttemann, S., 01.03.2024, In: Neue Zeitschrift für Wirtschafts-, Steuer- und Unternehmensstrafrecht. 13, 3, p. 81-93 13 p.

    Research output: Journal contributions › Journal articles › Research › peer-review

  13. Published

    Rechtsphilosophie nach Hegel: 200 Jahre Grundlinien der Philosophie des Rechts

    Ausberg, I. (Editor), Koshan, M. (Editor), Terhechte, J. (Editor) & Vieweg, K. (Editor), 01.01.2024, Brill | Fink. 224 p. (jena-sophia. Studien und Editionen zum deutschen Idealismus und zur Frühromantik ; vol. 20)

    Research output: Books and anthologies › Collected editions and anthologies › Research

  14. Published

    § 2 Union legal framework of the TCA

    Terhechte, J., 2024, EU-UK Trade and Cooperation Agreement: A Handbook. Kübek, G., Tams, C. J. & Terhechte, J. P. (eds.). 1. ed. Oxford: Nomos Verlagsgesellschaft, p. 9-22 14 p.

    Research output: Contributions to collected editions/works › Chapter

  15. Published

    § 3 Grundlagen des Internationalen Wirtschaftsrechts

    Terhechte, J., 2024, Kompendium Öffentliches Wirtschaftsrecht . Schmidt, R. & Wollenschläger, F. (eds.). Berlin, Heidelberg: Springer Berlin, p. 133-186 54 p.

    Research output: Contributions to collected editions/works › Contributions to collected editions/anthologies › Education

  16. Published

    EU-UK Trade and Cooperation Agreement: A Handbook

    Kübek, G. (Editor), Tams, C. J. (Editor) & Terhechte, J. (Editor), 2024, 1. ed. Baden-Baden: Nomos Verlagsgesellschaft. 550 p.

    Research output: Books and anthologies › Collected editions and anthologies › Research

  17. Published

    Introduction

    Kübek, G., Tams, C. J. & Terhechte, J., 2024, EU-UK Trade and Cooperation Agreement: A Handbook. Kübek, G., Tams, C. J. & Terhechte, J. P. (eds.). 1. ed. Baden-Baden: Nomos Verlagsgesellschaft, p. 3-8 6 p.

    Research output: Contributions to collected editions/works › Other › Research

  18. Published

    Succession in respect of cession, unification and separation of States.

    Devaney, J. G. & Tams, C. J., 2024, General International Law in International Investment Law: A Commentary. Kulick, A. & Waibel, M. (eds.). Oxford University Press, p. 428-442 15 p.

    Research output: Contributions to collected editions/works › Chapter › peer-review

  19. 2023
  20. Published

    Punitive Menschenrechte – Der Anspruch des Opfers auf Bestrafung im europäischen Grundrechtsgefüge

    Hüttemann, S., 10.12.2023, In: Juristenzeitung. 78, 22, p. 1001-1010 10 p.

    Research output: Journal contributions › Journal articles › Research › peer-review

  21. Published

    Die Eigenständigkeit der Bundeswehrverwaltung als Verfassungsgebot: Neue Organisations- und Personalentwicklungen in der Bundewehr im Lichte der "Zeitenwende"

    Terhechte, J., 07.12.2023, Baden Baden: Nomos Verlagsgesellschaft. 150 p.

    Research output: Books and anthologies › Monographs › Research

  22. Published

    The Genocide Convention: article-by-article commentary

    Tams, C. J., Berster, L. & Schiffbauer, B., 12.2023, Second edition ed. München, New York: C.H. Beck Verlag. 539 p.

    Research output: Books and anthologies › Book

  23. Published

    Christian J. Tams, Review of Tommaso Soave. The Everyday Makers of International Law: From Great Halls to Back Rooms

    Tams, C. J., 01.11.2023, In: European Journal of International Law. 34, 4, p. 1053-1058 6 p.

    Research output: Journal contributions › Critical reviews › Research

  24. Published

    Controlling consent: insights from binding dispute settlement

    Tams, C. J., 11.2023, Consenting to international law. Besson, S. (ed.). Cambridge, UK: Cambridge University Press, p. 72-99 28 p.

    Research output: Contributions to collected editions/works › Chapter › peer-review

  25. Published

    Who’s afraid of the articles on state responsibility

    Tams, C. J., 09.2023, Arbitration’s Age of Enlightenment?. Bull SC, C., Malintoppi, L. & Partasides KC, C. (eds.). Wolters Kluwer, p. 211-225 15 p. (ICCA congress series; vol. 21).

    Research output: Contributions to collected editions/works › Chapter

  26. Published

    European Yearbook of International Economic Law 2022

    Bäumler, J. (Editor), Binder, C. (Editor), Bungenberg, M. (Editor), Krajewski, M. (Editor), Rühl, G. (Editor), Tams, C. J. (Editor), Terhechte, J. (Editor) & Ziegler, A. R. (Editor), 24.05.2023, Cham: Springer International Publishing. 581 p. (European Yearbook of International Economic Law; vol. 13)

    Research output: Books and anthologies › Collected editions and anthologies › Research

  27. Published

    A pénzügyi szektorban működő vállalatokkal szembeni pénzbírságok: a kérdéses felső határok kumulálása

    Hüttemann, S. D., 24.04.2023, In: Miskolci Jogi Szemle. 17, 5, p. 61-75 15 p.

    Research output: Journal contributions › Journal articles › Research › peer-review

  28. Published

    International Investment Law and General International Law: Radiating Effects?

    Tams, C. J. (Editor), Schill, S. W. (Editor) & Hofmann, R. (Editor), 01.01.2023, Edward Elgar Publishing. 404 p. (Frankfurt Investment and Economic Law series)

    Research output: Books and anthologies › Book

  29. Published

    Die Einheit des Unionsrechts und die Idee eines europäischen Verfassungsrechts – Relâche? Pas du tout!

    Terhechte, J., 2023, Der Staat der Netzwerkgesellschaft: Karl-Heinz Ladeurs Verständnis von Staat und Gesellschaft. Augsberg, I. (ed.). Baden Baden: Nomos Verlagsgesellschaft, p. 159-180 22 p.

    Research output: Contributions to collected editions/works › Contributions to collected editions/anthologies › Research

  30. Published

    Die Hamburger Verfassung im europäischen Kontext

    Terhechte, J., 2023, Verfassung der Freien und Hansestadt Hamburg : Kommentar. Knops, K.-O. & Jänicke, S. P. J. (eds.). Baden Baden: Nomos Verlagsgesellschaft, p. 54-71 18 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  31. Published

    Erga omnes-Verpflichtungen vor dem Internationalen Gerichtshof: ein Kontrapunkt

    Tams, C. J., 2023, Der Schutz des Individuums durch das Recht: Festschrift für Rainer Hofmann zum 70. Geburtstag. Donath, P. B., Heger, A., Malkmus, M. & Bayrak, O. (eds.). Berlin, Heidelberg: Springer Verlag, p. 43-56 14 p.

    Research output: Contributions to collected editions/works › Chapter › peer-review

  32. Published

    Kommentierung von Art. 114 AEUV: Rechtsangleichung im Binnenmarkt

    Terhechte, J. & Kübek, G., 2023, Frankfurter Kommentar zu EUV, GRC und AEUV: Band 3: AEUV, Artikel 101-215. Pechstein, M., Nowak, C. & Häde, U. (eds.). Tübingen: Mohr Siebeck Verlag, Vol. 3. p. 491-545 55 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  33. Published

    Kommentierung von Art. 115 AEUV: Nationales Recht mit unmittelbarer Auswirkung àu den Binnenmarkt, Rechtsangleichung

    Terhechte, J. & Kübek, G., 2023, Frankfurter Kommentar zu EUV, GRC und AEUV: Band 3: AEUV, Artikel 101-215. Pechstein, M., Nowak, C. & Häde, U. (eds.). Tübingen: Mohr Siebeck Verlag, Vol. 3. p. 546-556 11 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  34. Published

    Kommentierung von Art. 116 AEUV: Behandlung bestehender wettbewerbsverzerrender Vorschriften

    Terhechte, J. & Kübek, G., 2023, Frankfurter Kommentar zu EUV, GRC und AEUV: Band 3: AEUV, Artikel 101-215. Pechstein, M., Nowak, C. & Häde, U. (eds.). Tübingen: Mohr Siebeck Verlag, Vol. 3. p. 557-562 6 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  35. Published

    Kommentierung von Art. 117 AEUV: Behandlung geplanter wettbewerbsverzerrender Vorschriften

    Terhechte, J. & Kübek, G., 2023, Frankfurter Kommentar zu EUV, GRC und AEUV: Band 3: AEUV, Artikel 101-215. Pechstein, M., Nowak, C. & Häde, U. (eds.). Tübingen: Mohr Siebeck Verlag, Vol. 3. p. 563-567 5 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  36. Published

    Kommentierung von Art. 118 AEUV: Schutz des geistigen Eigentums

    Terhechte, J. & Kübek, G., 2023, Frankfurter Kommentar zu EUV, GRC und AEUV: Band 3: AEUV, Artikel 101-215. Pechstein, M., Nowak, C. & Häde, U. (eds.). Tübingen: Mohr Siebeck Verlag, Vol. 3. p. 568-585 18 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  37. Published

    Kommentierung von Art. 26 AEUV: Binnenmarkt

    Terhechte, J., 2023, Frankfurter Kommentar zum EUV, GRC und AEUV: Band 2: AEUV, Präambel, Artikel 1-100. Pechstein, M., Nowak, C. & Häde, U. (eds.). 2. ed. Tübingen: Mohr Siebeck Verlag, Vol. Band 2. p. 399-416 18 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  38. Published

    Kommentierung von Art. 27 AEUV: Ausnahmen

    Terhechte, J., 2023, Frankfurter Kommentar zum EUV, GRC und AEUV: Band 2: AEUV, Präambel, Artikel 1-100. Pechstein, M., Nowak, C. & Häde, U. (eds.). 2. ed. Tübingen: Mohr Siebeck Verlag, Vol. Band 2. p. 417-422 6 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  39. Published

    Kommentierung von Art. 2 EUV: Werte der Union

    Terhechte, J., 2023, Frankfurter Kommentar zum EUV, GRC und AEUV: Band 1: EUV und GRC . Pechstein, M., Nowak, C. & Häde, U. (eds.). 2. ed. Tübingen: Mohr Siebeck Verlag, Vol. Band 1. p. 76-96 21 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  40. Published

    Kommentierung von: Art. 41 GRC: Recht auf eine gute Verwaltung

    Terhechte, J., 2023, Frankfurter Kommentar zu EUV, GRC und AEUV: Band I: EUV und GRC . Pechstein, M., Nowak, C. & Häde, U. (eds.). 2. ed. Tübingen: Mohr Siebeck Verlag, Vol. Band 1. p. 1597-1609 13 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  41. Published

    Kommentierung von: Art. 49 EUV: Beitritt zur Union

    Terhechte, J., 2023, Frankfurter Kommentar zu EUV, GRC und AEUV: Band I: EUV und GRC . Pechstein, M., Nowak, C. & Häde, U. (eds.). 2. ed. Tübingen: Mohr Siebeck Verlag, Vol. Band 1. p. 921-944 24 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  42. Published

    Kommentierung von Art. 53 EUV: Unbegrenzte Geltung

    Terhechte, J., 2023, Frankfurter Kommentar zum EUV, GRC und AEUV: Band 1: EUV und GRC . Pechstein, M., Nowak, C. & Häde, U. (eds.). 2. ed. Tübingen: Mohr Siebeck Verlag, Vol. Band 1. p. 971-977 7 p.

    Research output: Contributions to collected editions/works › Contributions in collection of commentaries › Research

  43. Published

    Priyasha Saksena, Sovereignty, International Law and the Princely States of Colonial South Asia

    Tams, C. J., 2023, In: German Yearbook of International Law. 66, 1, p. 409-412 4 p.

    Research output: Journal contributions › Critical reviews › Research

  44. 2022
  45. Published

    International investment protection and constitutional law

    Schill, S. W. (Editor) & Tams, C. J. (Editor), 22.11.2022, Edward Elgar Publishing. 380 p. (Frankfurt Investment and Economic Law series)

    Research output: Books and anthologies › Book

  46. Published

    Humanitarian intervention

    Tams, C. J., 06.09.2022, Elgar Encyclopedia of Human Rights. Binder, C., Nowak, M., Hofbauer, J. A. & Janig, P. (eds.). Northampton, MA: Edward Elgar Publishing, p. 499-504 6 p.

    Research output: Contributions to collected editions/works › Articles for encyclopedia › Research

  47. Published

    European Yearbook of International Economic Law 2021

    Bäumler, J. (Editor), Binder, C. (Editor), Bungenberg, M. (Editor), Krajewski, M. (Editor), Rühl, G. (Editor), Tams, C. J. (Editor), Terhechte, J. (Editor) & Ziegler, A. R. (Editor), 06.07.2022, Cham: Springer International Publishing. 369 p. (European Yearbook of International Economic Law; vol. 12)

    Research output: Books and anthologies › Collected editions and anthologies › Research

  48. 2021
  49. Published

    In re Arbitration Between the Italian Republic and the Republic of India Concerning the “Enrica Lexie” Incident

    Devaney, J. G. & Tams, C. J., 07.2021, In: American Journal of International Law. 115, 3, p. 513-519 7 p.

    Research output: Journal contributions › Scientific review articles › Research