Among other things, Article 38 of the Statute of the International Court of Justice, refers to, subject…

International Conventions, whether general or particular, establishing rules expressly recognized by the contesting states.

Whenever a treaty or convention in force provides for reference of a matter to a tribunal to have been instituted by the League of Nations, or to the Permanent Court of International Justice, the matter shall, as between the parties to the present Statute, be referred to the International Court of Justice.

In the absence of an agreement as to which language shall be employed, each party may, in the pleadings, use the language which it prefers; the decision of the Court shall be given in French and English. In this case the Court shall at the same time determine which of the two texts shall be considered as authoritative.

The decision of the Court has no binding force except between the parties and in respect of that particular case.