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The High Contracting Parties agree that any disputes which might arise between them relating to the interpretation or application of this Convention shall, if they cannot be settled by direct negotiation, be referred for decision to the Permanent Court of International Justice. In case any or all of the High Contracting Parties parties to such a dispute should not be Parties to the Protocol bearing the date of December 16th, 1920, relating to the Permanent Court of International Justice, the dispute shall be referred, at the choice of the parties and in accordance with the constitutional procedure of each party, either to the Permanent Court of International Justice or to a court of arbitration constituted in accordance with the Convention of October 18th, 1907, for the Pacific Settlement of International Disputes, or to some other court of arbitration.