Authority in International Law

"I’ve spoken about authority in the context laid out by Article 38 of the ICJ Statute, that is, where and how we look when subsidiary means are needed to determine already existing rules of law. […] I’ve suggested that when the need for law determination does occur, sources with appropriate authority are readily there to be found, that they stand in no hierarchical relationship to one another, nor do they need to. I’ve argued that rational criteria exist as to which ones deserve to be featured with greater authority in a particular case.