Article 21

If there should arise between the High Contracting Parties a dispute of any kind relating to the interpretation or application of the present Convention and if such dispute cannot be satisfactorily settled by diplomacy, it shall be settled in accordance with any applicable agreements in force between the parties providing for the settlement of international disputes.

In case there is no such agreement in force between the parties, the dispute shall be referred to arbitration or judicial settlement, in accordance with the constitutional procedure of each of the parties to the dispute. In the absence of agreement on the choice of another tribunal, the dispute shall be referred to the Permanent Court of International Justice, if all the parties to the dispute are parties to the Protocol of the 16th December, 1920, relating to the Statute of that Court, and if any of the parties to the dispute is not a party to the Protocol of the 16th December, 1920, the dispute shall be referred to an arbitral tribunal constituted in accordance with the Hague Convention of the 18th October, 1907, for the Pacific Settlement of International Conflicts.