Ortner, The Applicable Law, in: Handbook on Arbitration and ADR (LexisNexis) 2021.

Ortner/Schwarz, Does a Right to a Physical Hearing Exist in international Arbitration? (ICCA) 2021.

Ortner, In a Worldwide First, Austrian Supreme Court Confirms Arbitral Tribunal’s Power to Hold Remote Hearings Over One Party’s Objection and Rejects Due Process Violation (Kluwer) 2020

Ortner/Trenor/Schwarz (eds.), Contractual Performance and COVID-19 – An In-Depth Comparative Law Analysis (Wolters Kluwer) 2020.

Thiede, Thomas/Koch, Bernhard/Ortner, Helmut, Internationales Privat- und Verfahrensrecht, 5. Auflage, Wien 2018.
Deutsch-europäisches Juridicum (DEJ), IPR 0102-44:5

How to Apply the Applicable Law in International Arbitration, in: Austrian Yearbook on International Arbitration 2017.
Europa-Institut AV 3-39:8

Comparative Study of "Arbitrability" under the New York Convention Country Report for Austria, in: Country Report for Austria, IBA Subcommittee on Recognation and Enforcement of Arbitral Awards, 2016.

Thomas Thiede/ Bernhard A. Koch/ Helmut Ortner, Internationales Privat- und Verfahrensrecht : Textsammlung, 3. Auflage, 2015.
Deutsch-europäisches Juridicum (DEJ), IPR 0102-44:3

Private Law in Graphs, 4. Auflage, 2015.

Religious Communities as Public Corporations,  in: Walter Hetzenauer (ed), Colloquium Series 20/2014, 35-89. 

International Cooperation, in: The Executive, 2011.

In the Mood for Mooting?, with Christian Koller in: Juristl, 2011.

The Legal Status of Corporations Under Public Law, in: Kohlhofer (ed), New Legal Perspectives, 2011. 

Austrian Arbitration Law  Contribution, in: Rowley (ed), Arbitration World, with Andreas Reiner, 2010.

The Logic of International Arbitration Practice  Contribution, in: Verschraegen (ed), Interdisciplinary Studies of Comparative and Private International Law, 2010

YAAP Anniversary Program, Anti-Suit and Anti-Arbitration Injuctions on 26 November 2009, ScheidsVZ 2/2010, with Valentina Wong.

Economic Analysis of Law, in: Barta (ed), Private Law, 2009 

The Arbitration Procedure - Procedural Order Public and the Internationalization of Public Policy in Arbitration, in: Klausegger et al (Hrsg.), Austrian Arbitration Yearbook, 2008, S. 133-220 (Kapitel III).
http://www.kluwerarbitration.com/document/kli-ka-1006-225?q=%22austrian%20arbitration%20yearbook%22%20AND%20%22ortner%22

The New Directive 2008/48/EC on Credit Agreements for Consumers, German Law Journal, 2008.

The Proposal for a New Directive Concerning Credit for Consumers, European & International Law, Nemeth, Kristin; Ortner, Helmut, 2008, S. 801-820.

The Origin of the "Knowledge Economy", European Journal of European Economic History, 2006, S. 427-461.
http://www.jeeh.it/articolo?urn=urn:abi:abi:RIV.JOU:2006;2.427&ev=

Rationality and Religion, Staat und Religion, 2007.

Rationality, religion and the state, in: Religion, Staat, Gesellschaft, 2007, S- 261-289.

Contracts and Cyberworld, Wien 2005 (Juristische Schriftenreihe)

Building Projects on Allotments - Part II, Wohnrechtliche Blätter, 2006.

Practical Case, Juristische Ausbildung und Praxis, Vol. 1, 2006, S. 64.

Practical Case, Juristische Ausbildung und Praxis, Vol. 3, 2004, S. 191.

Practical Case, Juristische Ausbildung und Praxis, Vol. 1, 2004, S. 63.

Restitution of Arianized Art Work on the Basic of the Civil Code, Juridikum, Vol. 1, 2003.

Practical Case, Juristische Ausbildung und Praxis, Vol. 4, 2003, S. 241.

Practical Case, Juristische Ausbildung und Praxis, Vol. 3, 2003, S. 177.

Practical Case, Juristische Ausbildung und Praxis,, Vol. 2, 2003, S. 118-121.

Proposal for a New Directive for Consumer Credit, Österreichs Bankenarchiv, Vol. 11, 2003, S. 801.

Staats- und Gesellschaftsfeindlichkeit und gesetzliche Anerkennung, in: Juridicum 3, 2001, S. 117-123.

Constitutional Neutrality and Secularity, Verlag Österreich.

Concise Hornbook on Private Law.