Artikel 21

If the nomination of the members of the Arbitral Tribunal is not made within a period of three months from the date on which one of the parties requested the other party to constitute an Arbitral Tribunal, the task of making the necessary nominations shall be entrusted to the Government of a third State, chosen by agreement between the parties, or, failing agreement within three months, to the President of the International Court of Justice. Should the latter be a national of one of the parties to the dispute, this task shall be entrusted to the Vice-President of the Court, or to the next senior judge of the Court who is not a national of the parties.