From: Oxford Public International Law (http://opil.ouplaw.com). (c) Oxford University Press, 2023. All Rights Reserved.date: 12 February 2025
- Subject(s):
- Resolutions of international organizations — Customary international law — Sources of international law — Treaties, effect for third states — Codification — Judicial decisions — Opinio juris — State practice
Published under the auspices of the Max Planck Institute for Comparative Public Law and International Law under the direction of Professor Anne Peters (2021–) and Professor Rüdiger Wolfrum (2004–2020).
Editor’s Note: A different entry under the title ‘Customary International Law’, written in November 2006 by Tullio Treves, appeared as part of the online Max Planck Encyclopedia of Public International Law until the publication of this entry in 2025. This new entry, which is partly based on the original entry, has been published at the same web address (URL). The original entry was also published in the 2012 print edition of the Encyclopedia (R Wolfrum (ed) The Max Planck Encyclopedia of Public International Law (OUP Oxford 2012) vol II, 937–57). 1 The term...
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