Public International Law

Publication
D'Aspremont, J., The Discourse on Customary International Law, Oxford, Oxford University Press, 2021.
Along with treaties, custom is one of the sources of international law. It is known to consist of two elements: state practice and opinio juris. While many studies have looked at traditional questions of how to identify customary law, this book takes a new and original approach.
Publication
Fitzmaurice, M., P. Merkouris, Treaties in Motion. The Evolution of Treaties From Formation to Termination, 2021
The law of treaties is in constant motion, understood not only as locomotion, but also as motion through time and as change. Thus, kinesis and stasis, two sides of the same concept of 'motion', are the central themes of Treaties in Motion.
Research guide
Other | International Customary Law | Peace Palace Library
According to Article 38 of its Statute, the International Court of Justice 'whose function is to decide in accordance with international law such disputes as are submitted to it,' has to apply, inter alia, 'international custom.' This source of public international law is described, in t
Research guide
Treaties
Treaties play a fundamental role in international relations. They are recognized as a  source of  international law in Article 38 of the Statute of the International Court of Justice. Therefore, the Vienna Convention on the Law of Treaties was adopted in 1969.