Dinstein, Yoram Keywords: Treaties | International customary law | Law of treaties | Mots clefs: Traités | Droit coutumier international | Droit des traités | ABSTRACT Yoram Dinstein, Professor emeritus of the University of Tel Aviv, reminds us that Article 38 of the Statute of the International Court of Justice prescribes three strata – often referred to as "sources" – of international law. This study is confined to the interaction between two of those strata, namely treaties and customs, and does not deal with the gene…