Cultural Self-comprehension of Nations (1978)

The Concept of Monotheism in Islam and Christianity (1982)

The Principles of Non-Alignment. The Non-aligned Countries in the Eighties: Results and Perspectives (1982)

Democracy in International Relations (1986)

Democracy and Human Rights. Do Human Rights Concur with Particular Democratic Systems? (1990)

The Invasion of Panama and International Law (1990)

Democracy and the New World Order (1993)

Ethische Aspekte der Sanktionen im Völkerrecht. Die Praxis der Sanktionspolitik und die Menschenrechte (1994)

Democracy after the End of the East-West Conflict (1995)

The United Nations and International Democracy (1995)

The United Nations and International Democracy. The Quest for UN Reform (1997)

Economic Sanctions and Development (1997)

Civilizations - Conflict or Dialogue? (1999)

Globality versus Democracy? The Changing Nature of International Relations in the Era of Globalization (2000)

The Concept of Humanitarian Intervention in the Context of Modern Power Politics. Is the Revival of the Doctrine of "Just War" Compatible with the International Rule of Law? (2001)

The Lockerbie Trial. Documents Related to the I.P.O. Observer Mission (2002)

The Iraq Crisis and the United Nations. Power Politics vs. the International Rule of Law (2004)

The Use of Force in International Relations: Challenges to Collective Security (2006)

The "Global War on Terror" and the Question of World Order (2008)

The Security Council as Administrator of Justice? (2011)

Kastellorizo: The Geopolitics of Maritime Boundaries and the Dysfunctionality of the Law of the Sea (2020)

Austria, Neutrality and Non-alignment (2021) 

MMXXII : WAR OR PEACE (2023)