Patent law and social policy under the TRIPS Agreement, Baden-Baden 2002.

The Implementation of the Doorstep Selling Directive in the Member States, Baden-Baden 2000.

European Consumer Law, 2nd ed., Antwerp 2014, with Norbert Reich, Hans-W. Micklitz and Klaus Tonner.

Collective Legal Protection in Capital Market Law - Evaluation of the Capital Investor Model Case Act, Frankfurt 2010, with Axel Halfmeier and Eberhard Feess.

Understanding EU Consumer Law, Antwerp 2009, with Norbert Reich and Hans-W. Micklitz.

Consumer Protection through Injunctions, Baden-Baden 2007, with Hans-W. Micklitz, Ulrike Docekal and Peter Kolba.

Directive (EU) 2023/2225 of the European Parliament and of the Council of 18 October 2023 on credit agreements for consumers and repealing Directive 2008/48/EC (Consumer Credit Directive 2023), in: Reiner Schulze and Esther Arroyo Amayuelas (eds.), EU Consumer Law, C.H. Beck/Hart Publishing/Nomos, 2026, 959–1160, with Karin Sein.

Consumer Credit, in: Klaus Tonner/Tobias Brönneke/Felix Buchmann/Peter Rott (eds.), Consumer Law, 4th ed., Nomos 2025, 669–749.

Consumer Protection in the Context of Energy Supply Contracts, in: Klaus Tonner, Tobias Brönneke, Felix Buchmann and Peter Rott (eds.), Consumer Law, 4th ed., Nomos 2025, 525–551.

European Union Law, in: Sir Roy Goode (ed.), Consumer Credit Law and Practice, since the 30th ed., London 2009 (last updated for the 79th ed., 2025).

Consumer Protection, in: Manfred Dauses and Markus Ludwigs (eds.), Handbook of EU Commercial Law, 54th ed., C.H. Beck 2021, Vol. V, with Hans-W. Micklitz (sole commentator on Parts 3 (Financial Services), 4 (Product Liability) and 7 (Cross-Border Consumer Protection); co-authored commentary on Parts 1 (Fundamentals), 2 (General Contract Law) and 6 (Legal Protection)).

Special Issue: The Sharing Economy and the Neglected Law on the Hire of Movable Property, EuCML 3/2026, with Karin Sein.

Consumer Law, 4th ed., Nomos 2025, with Klaus Tonner, Tobias Brönneke and Felix Buchmann.

Special Issue: Representative Actions, Revue européenne de droit de la consummation / European Journal of Consumer Law 2/2024, with Jeroen de Ceuster.

Special Issue: Climate and Environmental Governance, *European Journal of Comparative Law and Governance* 3–4/2023, with Aurelia Colombi Ciacchi.*Certification – Trust, Accountability, Liability*, Dordrecht et al., 2019.

Online Mediation Platforms in Legal Practice, Baden-Baden 2018, with Klaus Tonner.

Varieties in European Economic Law – Liber amicorum for Hans Micklitz, Dordrecht et al. 2014, with Kai Purnhagen.

Liability Law in the Third Millennium – Liber Amicorum for Gert Brüggemeier, Baden-Baden 2009, with Aurelia Colombi Ciacchi, Christine Godt and Lesley Jane Smith.

The Future of Consumer Credit Regulation: Creative Approaches to Emerging Problems, Aldershot 2008, with Michelle Kelly-Louw and James P. Nehf.

Access and Exclusion as a Subject of Private Law, Yearbook of Young Civil Law Scholars 2005, Stuttgart 2006, with Axel Halfmeier, Aurelia Colombi Ciacchi, Olaf Deinert, Tina Kolle and Sandy Thalheim.

The Hire of Movable Property under German Law: Many Unfair Terms but Little Control, EuCML 2026, 136–140.

TThird-Party Funding, Legal Tech and Collective Consumer Protection – Experiences from Germany, European Review of Private Law 2026, 163–172.

The Thermofenster Saga, or How German Authorities and Courts Ignore the ECJ, VuR 2026, 51–56.

‘Naming and Shaming’ or Consumer Protection through Naming Names, VuR 2025, 431–450.

Digital fairness and the burden of proof, Journal of Consumer Policy 2025, 297–314.

Dark patterns, the Digital Services Act and the law on fair trading, VuR 2025, 216–218.

Debt collection in Germany: public law regulation, unfair commercial practices and data protection law, EuCML 2025, 29–35.

The implementation of the Collective Redress Directive in Germany, Zeitschrift für Verbraucherrecht (VbR) 2024, 172–177.

The right of consumer organisations to seek the cessation of infringements and its limits, VuR 2024, 454–457.

The new German representative action – A mixed bag, Revue européenne de droit de la consommation / European Journal of Consumer Law 2024, 255–275.

Towards digital fairness, EuCML 2024, 24–30, with Hans-W. Micklitz, Natali Helberger, Betül Kas, Monika Namysłowska, Laurens Naudts, Marijn Sax and Michael Veale.

The prosumer in energy law – first needs a photovoltaic system or a wind turbine, VuR 2023, 443–446.

Improvement, watering down or more of the same? – On the reform of EU consumer credit law, VuR 2022, 283–292.

Effectiveness of consumer law, Revista de Direito do Consumidor 140 (2022), 123–146.

The Accessibility Act – Part 1: Conceptual Foundations, Part 2: Civil-law Remedies, Part 3: Collective Civil-law Remedies, Specialist Articles E6-2021, E7-2021 and E8-2021 at www.reha-recht.de.

Rights of People with Disabilities under the New Rail Passengers’ Rights Regulation, specialist article E1-2021 at www.reha-recht.de.

Small loans via online platforms, BKR 2021. 453–459.

Obstacles to Legal Tech Services: Examples from Germany and Estonia, EuCML 2021, 101–108, with Karin Sein.

The Digitalisation of Cars and the New Digital Consumer Contract Law, Journal of Intellectual Property, Information Technology and E-Commerce Law 2021, 156–168.

Powerful private players in the digital economy: between private law freedoms and the principle of equality, Baltic Yearbook of International Law 2020, 32–51.

Compensation for Vaccination Damage under German Social Security Law, Otago Law Review 2020, 199–217.

Greater legal certainty for legal tech debt collection following the Federal Court of Justice’s ruling on rent controls, WuM 2020, 185–191.

Theses on the implementation of consumer protection law by BaFin, WM 2019, 1189–1196.

Regulating certification bodies in the field of medical devices: The PIP breast implants litigation and beyond, European Review of Private Law 2019, 403–428, with Carola Glinski.

Enforcement of the law through legal tech debt collection, using the rent control scheme as an example – benefit or risk for consumers?, VuR 2018, 443–447.

The role and liability of certification organisations in transnational value chains, 23 Deakin Law Review (2018), 83–118, with Carola Glinski.

Bundled contracts from a consumer law perspective, GRUR Int. 2018, 1010–1020.

A ‘New Deal’ for collective action claimants?, Zeitschrift für Verbraucherrecht (VbR) 2018, 136–141, with Axel Halfmeier.

Class actions with teeth? – On the proposal for a directive on class actions to protect the collective interests of consumers, VuR 2018, 243–250, with Axel Halfmeier.

Consumer ADR in Germany, EuCML 2018, 121–125.

Remedies for Damage Caused by Vaccines: A Comparative Study on Four European Legal Systems, European Review of Private Law 2018, 57–95, with Eleonora Rajneri, Jean-Sébastien Borghetti and Duncan Fairgrieve.

Directors’ Duties and Corporate Social Responsibility under German Law – Is Tort Law Litigation Changing the Picture?, Nordic Journal of Commercial Law 2017, 11–27.

Data protection law as consumer law – How consumer organisations can contribute to the enforcement of data protection law, EuCML 2017, 113–119.

Duties and liability of the ‘notified body’ in relation to high-risk medical devices, NJW 2017, 1146–1148.

The claim for remedial measures by consumer organisations, Zeitschrift für Verbraucherrecht (VbR) 2016, 172–176.

The private international law aspects of consumer association actions, EuZW 2016, 733–736.

Claims Management Services – An Alternative to ADR?, European Review of Private Law 2016, 143–160.

The basic account under the draft Payment Accounts Act, VuR 2016, 3–9.

Energy-efficiency refurbishment versus social protection: on the interplay between tenancy law and SGB II, Social Law 2015, 86–98, with Sabine Knickrehm.

Supply Chain Liability of Multinational Corporations?, European Review of Private Law 2015, 415–436, with Vibe Ulfbeck.

The ‘average consumer’ – a thing of the past in the age of personalised marketing?, VuR 2015, 163–167.

The Liability of Certification Bodies under Product Safety Law, ZEuP 2015, 192–210, with Carola Glinski.

The new Mortgage Credit Directive 2014/17/EU and its implications for German law, BKR 2015, 8–14.

Consumer protection through creditworthiness checks, EWS 2014, 201–204.

The adjustment of long-term supply contracts – Experience from German gas price case law, European Review of Private Law 2013, 717–745.

A plea for special treatment of financial services in unfair commercial practices law, euvr 2013, 61–68.

Legal terminology – One reason for frictions between German and European consumer law, European Review of Private Law 2012, 1353–1368.

More coherence? A higher level of consumer protection? – A review of the new Consumer Rights Directive 2011/83/EU, European Journal of Consumer Law 2012, 371–390.

Liberalisation and protection of vulnerable customers in services of general interest, Europarättslig Tidskrift 2011, 483–502.

Creditworthiness checks: Does classification under public law hinder consumer protection?, VuR 2011, 163–169, with Evelyne Terryn and Christian Twigg-Flesner.

The Proposal for a Directive on Consumer Rights: No Single Set of Rules, ZEuP 2009, 456–488, with Evelyne Terryn.

Collective Consumer Protection and Money Matters, in: Alexander Klauser (ed.), Consumer Protection in Society, Politics and Law, Festschrift for Peter Kolba, facultas Universitätsverlag 2026, 273–284.

Consumer Protection in the Hire of Movable Property, in: Christoph Fasel and Steffen Kroschwald (eds.), Values and Law – Environmental and Consumer Protection in a Democratic Constitutional State, Festschrift for Tobias Brönneke, vunk 2026, 189–207.

Collective Enforcement of Rights in Germany, in: Alexander Klauser/Peter Kolba/Katharina Huber (eds.), Handbook of Class Actions, facultas Universitätsverlag 2025, 113–122.

The EU Directive on Class Actions – Implementation in Germany, in: Alexander Klauser, Peter Kolba and Katharina Huber (eds.), Handbook on Class Actions, facultas Universitätsverlag 2025, 73–85.

Germany, in: Civic Consulting, British Institute of International and Comparative Law, Asser Institute and Risk & Policy Analysis, Mapping Third-Party Litigation Funding in the European Union, European Commission 2025, https://commission.europa.eu/strategy-and-policy/policies/justice-and-fundamental-rights/civil-justice/civil-and-commercial-law/third-party-litigation-funding-tplf_en, 219–239.

Legal Tech and Data Protection: Enemies or Friends?, in: Martin Ebers and Karin Sein (eds.), Privacy, Data Protection and Data-driven Technologies, Routledge 2024, 272–284.

Burden of proof, in: Natali Helberger/Betül Kas/Hans-W. Micklitz/Monika Namysłowska/Laurens Naudts/Peter Rott/Marijn Sax/Michael Veale, Digital Fairness for Consumers, BEUC 2024, 242–258.

Germany: Who transformed whom?, in: Hans-W. Micklitz and Christian Twigg-Flesner (eds.), The transformation of consumer law and policy in Europe, Hart Publishing 2023, 261–279.

Dark patterns in consumer law, in: Maria Reiffenstein and Beate Blaschek (eds.), Consumer Policy Yearbook 2023, Verlag Österreich 2023, 181–202.

The transposition of Directives (EU) 2019/770 and 2019/771 in Germany, in: Matthias Baumgärtel/Gerd Kiparski (eds.), DGRI Yearbook 2021/2022, Otto Schmidt Verlag 2023, 335–350.

A Universal Service Framework for Powerful Online Platforms, in: BEUC (ed.), European Consumer Protection 2.0, www.beuc.eu/publications/beuc-x-2021-018_eu_consumer_protection.0_0.pdf, 2021, pp. 146–207, with Orla Lynskey.

‘Personalised Pricing and Personalised Commercial Practices’, in: BEUC (ed.), European Consumer Protection 2.0, www.beuc.eu/publications/beuc-x-2021-018_eu_consumer_protection.0_0.pdf, 2021, 92–145, with Orla Lynskey and Hans-W. Micklitz.

Product Liability in the Age of Digitalisation, in: Anja Hentschel/Gerrit Hornung/Silke Jandt (eds.), Human – Technology – Environment: Responsibility for a Socially Sustainable Future, Festschrift for Alexander Roßnagel, Nomos, 2020, 639–657.

Using claims management as a method to help vulnerable consumers, in: Christine Riefa and Severine Saintier (eds.), Vulnerable Consumers and the Law: Consumer Protection and Access to Justice, Routledge, 2020, 226–243.

Study on the collective enforcement of consumer claims in Germany, in: BMJV (ed.), Instruments of Legal Enforcement in Consumer Protection – A Comparative Legal Perspective on Germany, China and Brazil, Berlin 2020, 2–37.

Ageing and Consumer Protection, in: Kirsten Aner/Ute Karl (eds.), Handbook of Social Work and Ageing, 2nd ed., Springer, 2020, 337–347.

Deficient Standards by European Standardisation Organisations: Between State Liability and Tort Liability, in: Mariolina Eliantonio/Caroline Cauffmann (eds.), The Legitimacy of Standardisation as a Regulatory Technique in the EU, Edward Elgar, 2020, 131–155, with Carola Glinski.

Enforcement of Consumer Law in the Field of Financial Services, in: Tobias Brönneke, Andreas Willburger and Sabine Bietz (eds.), Enforcement of Consumer Law, Nomos, 2020, 89–108.

Dynamic and personalised pricing: between freedom of contract and arbitrariness, in: Jörn Lamla/Thomas Hess/Carsten Ochs/Michael Friedewald (eds.), The Future of the Data Economy, Springer, 2019, 285–305.

A Consumer Perspective on Algorithms, in: Lucila de Almeida/Marta Cantero Gamito/Mateja Durovic/Kai Peter Purnhagen (eds.), The Transformation of Economic Law, Hart Publishing, 2019, 43–63.

Certification of Medical Devices – Lessons from the PIP Scandal, in: Peter Rott (ed.), Certification – Trust, Accountability, Liability, Dordrecht et al., 2019, 189–211.

Consumers and services of general interest, in: Geraint Howells/Iain Ramsay/Thomas Wilhelmsson (eds.), Handbook of Research on International Consumer Law, 2nd ed., Cheltenham 2018, 267–307, with Chris Willett.

The EU Legal Framework for the Enforcement of Consumer Law, in: Hans-W. Micklitz and Genevieve Saumier (eds.), Enforcement and Effectiveness of Consumer Law, Dordrecht et al. 2018, 249–285.

The Contractual Position of the Online Platform Operator as an Intermediary, in: Peter Rott and Klaus Tonner (eds.), Online Intermediary Platforms in Legal Practice, Baden-Baden 2018, 62–80.

The article ‘Consumer Protection by BaFin?’, in: Eva Kocher/Doris Neuberger/Luca Ulbricht (eds.), Festschrift for Udo Reifner, 2018.

Consumer protection in the ‘sharing economy’, in: Christoph Brömmelmeyer/Martin Ebers/Mirko Sauer (eds.), Innovative Thinking between Law and the Market, Festschrift for Hans-Peter Schwintowski, 2017, 476–495.

Legal clarity, enforcement of the law and consumer law, in: Hans-W. Micklitz, Gesche Joost, Lucia Reisch and Helga Zander-Hayat (eds.), Consumer Law 2.0 – Consumers in the Digital World, Baden-Baden 2017, 221–264.

Legal Tech from a Consumer Perspective, in: Walter Blocher/Dirk Heckmann/Herbert Zech (eds.), DGRI Yearbook 2016, Cologne 2017, 111–132.

Regulatory enforcement in the UK, the Netherlands and the USA, in: Hans Schulte-Nölke (ed.), New Approaches to the Enforcement of Consumer Law, Berlin et al. 2017, 31–83.

Event-Driven Nature and Legal Development in Consumer Policy since the 1970s – A Historical and Legal Approach to Dealing with Crises and Scandals, in: Christian Bala et al. (eds.),Consumers in History and the Present: Change and Areas of Conflict in Consumer Policy, Düsseldorf 2017, 187–207, with Claudius Torp.

Unfair Contract Terms, in: Christian Twigg-Fiesner (ed.), Research Handbook on EU Consumer and Contract Law, Cheltenham 2016, 287–313.

Insufficient Prevention of Over-indebtedness – Legal and Policy Failures, in: Federico Ferretti (ed.), Comparative Perspectives on Consumer Over-indebtedness – A View from the UK, Germany, Greece and Italy, The Hague 2016, 189–205.

Art. 76: The ‘Stick to the Language’ Rule, in: Aurelia Colombi Ciacchi (ed.), Content and Effects of Contracts – Lessons to Learn from the Common European Sales Law, Dordrecht et al. 2016, 255–267.

The Low-Income Consumer in European Private Law, in: Kai Purnhagen and Peter Rott (eds.), Varieties of European Economic Law – Liber amicorum for Hans Micklitz, Dordrecht et al. 2014, 675–692.

Towards a Common European Sales Law, in: Daniela Heid, Rüdiger Stotz and Arsène Verny (eds.), Festschrift for Manfred A. Dauses, Munich 2014, 337–349.

The Court of Justice’s Principle of Effectiveness and its Unforeseeable Impact on Private Law Relationships, in: Stephen Weatherill and Dorota Leczykiewicz (eds.), The Involvement of EU Law in Private Law Relationships, Oxford 2013, 181–198.

Effective Enforcement of Consumer Law: The Comeback of Public Law and Criminal Law, in: James Devenney and Mel Kenny (eds.), European Consumer Protection: Theory and Practice, Cambridge 2012, 64–81.

Services of general interest, contract law and the welfare state, in: Jacobien Rutgers (ed.), European Contract Law and the Welfare State, Groningen 2012, 79–103.

Kickback payments under MiFID: Substantive or procedural standard of unconscionability?, in: Mel Kenny/James Devenney/Lorna Fox O’Mahoney (eds.), *Unconscionability in European Private Financial Transactions: Protecting the Vulnerable*, Cambridge 2010, 326–349, with Axel Halfmeier.

Collective actions by consumer organisations in Germany, in: Matthias Casper, André Janssen, Petra Pohlmann and Reiner Schulze (eds.), Towards a European Class Action?, Munich 2009, 259–275.

Cross-border collective damage actions in the EU, in: Fabrizio Cafaggi/Hans-W. Micklitz (eds.), New Frontiers of Consumer Protection: The Interplay between Private and Public Enforcement, Antwerp 2009, 379–398.

A legal and legal-policy analysis of modern debt collection practices; an expert report commissioned by the Federal Association of Consumer Organisations (Verbraucherzentrale Bundesverband e.V.), 2026.

Country report on Germany from the study Mapping Third-Party Litigation Funding in the European Union, carried out by Civic Consulting, the British Institute of International and Comparative Law, the Asser Institute and Risk & Policy Analysis P.p. for the European Commission, DG Justice and Consumers, 2025.

Comparative Legal Study on Procedural Rules and Their Impact on Collective Redress Actions in Europe, expert report commissioned by BEUC, 2025, with Laura Bugatti, Axel Halfmeier, Jagna Mucha and Wannes Vandenbussche.

Mechanisms for Amending General Terms and Conditions, expert report P.p. commissioned by the Verbraucherzentrale Bundesverband e.V., 2024, with Claire Feldhusen.

Chapter on the burden of proof in the study *Digital Fairness for Consumers*, expert report commissioned by BEUC, 2024, with Hans-W. Micklitz, Natali Helberger, Betül Kas, Monika Namysłowska, Laurens Naudts, Marijn Sax and Michael Veale.

Is there a need for consumer policy action on legal tech?, expert report commissioned by the Federal Association of Consumer Organisations (Verbraucherzentrale Bundesverband e.V.), 2023, here.

*The Regulatory Gap: Consumer Protection in the Digital Economy*, expert report p.p. commissioned by the European Consumer Organisations Bureau (BEUC), 2021, with Natali Helberger and Hans-W. Micklitz.

Legal section of the study“Evaluation of developments in the field of creditworthiness assessments for consumer property loan agreements”, conducted by the Institute for Financial Services e.V. Hamburg (iff) P.p. on behalf of the Federal Ministry of Justice and Consumer Protection, 2021, with Petra Buck-Heeb and Claire Feldhusen.

Legal section of the study on the preparation of the evaluation of the General Product Safety Directive by Civic Consulting for the European Commission, DG Growth, 2021.

A Universal Service Framework for Powerful Online Platforms, expert report P.p. by the European Consumer Organisations Bureau (BEUC), 2020, with Orla Lynskey.

Personalised Pricing and Personalised Commercial Practices, expert opinion P.p. commissioned by the European Consumer Organisations Bureau (BEUC), 2020, with Orla Lynskey and Hans-W. Micklitz.

Germany Country Report from the study to prepare the report on the implementation of the General Product Safety Directive by Civic Consulting for the European Commission, DG Growth, 2020, available at ec.europa.eu/info/sites/default/files/publication_of_part_2_country_reports_annexed_to_the_gpsd_implementation_study.pdf.

Chapter ‘Rights and redress’ of the study ‘Ex-post evaluation of the Consumer Programme 2007–2013 and mid-term evaluation of the Consumer Programme 2014–2020’ by Civic Consulting for the European Commission, DG Justice, 2018.

Study on the collective enforcement of consumer claims in Germany commissioned by GIZ, 2018.

Reform of the Injunctions Directive and compensation for consumers, expert report P.p. by the European Consumer Organisation (BEUC), 2018, with Axel Halfmeier.

Comprehensive report on injunctions as part of the study “Study for the Fitness Check of Consumer and Marketing Law” by Civic Consulting for the European Commission, DG Justice, 2017.

Expert report on identifying and assessing outstanding issues and challenges facing German consumer law policy in the 21st century for the Expert Council on Consumer Affairs at the Federal Ministry of Justice and Consumer Protection, 2016.

Regulatory enforcement of consumer protection in the UK, the Netherlands and the USA, expert report for the Federal Ministry of Justice and Consumer Protection, 2016.

Country report on Germany for the study “Study evaluating the status quo and the legal implications of third-party liability for the European security industry”, conducted by the European Centre of Tort and Insurance Law (ECTIL), Vienna, P.p. the European Commission, 2013.

Comparative law section and country report on Germany for the study “Study on the application of Directive 2005/29/EC on Unfair Commercial Practices in the EU” for Civic Consulting P.p. the European Commission, DG Justice, 2012.

Country report on Germany for the study “Digital Content Services for Consumers”, carried out by the Centre for the Study of European Contract Law (CSECL) and the Institute for Information Law (IViR) at the University of Amsterdam P.p. for the EU Executive Agency for Health and Consumers, 2010, comprehensive study.

“Extension of the Proposed Consumer Rights Directive to Cover the Online Purchase of Digital Products”, study P.p. by the European Consumer Organisations Bureau (BEUC), 2010.