Books:

• Philosophy of The Law of Nations, Montesa Jaellonica (2018)
• The Suicide of Europe, Montesa Jagellonica (2016)
• The Law of War, Cambridge University Press (Cambridge, 1987), 2nd ed. (2000); Routledge Press, 3d ed. (2013)
• International Law for Students, Jagellonica (Stockholm, 1989)
• International Law, Jagellonica (Stockholm, 1989)
• The Concept of International Law, Norstedt (Stockholm, 1987), 2nd ed. (1995)
• The International Legal Order, Gower (London, 1995)
• Ekonomisk integrationsrätt, Almquist & Wiksell (Stockholm, 1976)
• Bibliography of International Law, Bowker (New York, 1975)
• International Adoptions and the Conflict of Laws, Almquist & Wiksell (Uppsala, 1975)
• International Law and the Independent State, Gower (1974), 2nd ed. (1987)
• Finance and Protection of Investments in Developing Countries, Gower (1974), 2nd ed. Gower (1987)
• The East African Community and the Common Market, Longman (London, 1970)
• Essays on the Law of Treaties, Sweet & Maxwell (London 1967)
• Law Making by International Organizations, Norstedt (Stockholm, 1965)

Articles:

• New Forms of Sovereignty and the Right to Protect (R2P), Thomas More Institute website, March 16, 2011
• Extraordinary rendition, University of North Carolina Law Journal, 2008
• Illegal combatants and the Law of War, Law Journal of George Washington University, 2007
• Space satellites and jurisdiction, Rome Space Symposium, 1993
• Implementation of environmental conventions, SIRIL Occasional Papers, 1990
• Legal issues of privatization in Eastern Europe, SIRIL Occasional Papers, 1990

• The human environment: Stockholm and its follow-up, in Taylor & Groom, Global Issues in the UN Framework, MacMillan (New York, 1989)
• Ubåtsspionaget och folkrätten (Submarine espionage and international law), Svensk juristtidning,  1985
• South West Africa and the dilemma of the International Court, Newman Yearbook, University of Melbourne, 1966
• The problem of unequal treaties, International and Comparative Law Quarterly, 1966
• Organs of international organizations exercising their treaty making power, British Yearbook of International Law, 1962
• Aspects institutionnels de l’Association de Libre Echange (EFTA), Annuaire français de droit international, 1960

• What is international law and international relations?, Journal of International Studies, 1987
• Legal value of recommendations of international organizations, University College London Symposium, 1987
• Treaties of the modern era, published in Oxford World Encyclopedia, Oxford University Press (Oxford, 1986)
• International Straits and UNCLOS, Ezegodnik mezdunarodnovo pravo, Moscow, 1986
• Submarine espionage: misunderstandings, Svensk juristtidning, 1985

• Foreign warships and immunity for espionage, American Journal of international Law, 1984
• Super-tankers and international straits, Festschrift Schmidt, 1976
• Land-locked States and the Law of the Sea, Acta Scandinavia Juris Gentium, 1976

Presentations:

• Human Rights Violations and State Secession: An Evolving Standard?, Moderator at Conference of American Bar Association Section of International Law, Dublin Convention Centre, Dublin, Ireland, October 13, 2011.

• 

  Prof. Dr. Detter de Frankopan (Far Right) Moderates Panel Discussion on State Secession at American Bar Association Conference in Dublin. Other Panelists Include Judge Enver Hasani of Constitutional Court of Kosovo (Second From Right) and Prof. William Slomanson of Thomas Jefferson School of Law (Far Left).

• Lecture on Ethics and Law in the European Union at Conference of Entrepreneurs at Arena, Zagreb, Croatia, 2009
• Lecture on The Right to Protect; R2P – Aspects on Intervention and Related Issues at Georgetown University, Washington, D.C., 2008
• Guest Lecture on Illegal Combatants and the Law of War at George Washington University, Washington, D.C., 2006
• Guest Lecture on Humanitarian Intervention at the University of Ljubljana, Ljubljana, Slovenia, 2006
• Guest Lecture on Ethics and Humanitarian Intervention, Krakow, Poland, 2005
• Guest Lecture on Intervention, Padua, Italy, 1994
• Guest Lecture on The Proper Role of the United Nations in Croatia, Zagreb, Croatia, 1994
• Guest Lecture on Space Law, Rome, Italy, 1993
• Guest Lecture on Space Law, St. Petersburg, Russia, 1993
• Guest Lecture on Space Law, Moscow, Russia, 1993
• Guest Lecture on the Gulf War for Johns Hopkins University, Bologna, Italy, 1991
• Lecture on Environmental Liability, Seminar of the International Bar Association, Montreux, 1990
• Lecture on Theory of Law at the Academy of Science, Warsaw, Poland, 1990
• Lecture on the Theory of Law to the Institute for Law and State, Moscow, Russia, 1989
• Lecture on Human Rights, Beijing, Nanjing, Shanghai, 1989