Disputes — Arbitration — Procedure — Competence — Iran-United States Claims Settlement Declaration — Forum selection clause — Contracts containing provisions for settlement of disputes by Iranian courts — Cases arising therefrom outside the jurisdiction of the Iran-United States Claims Tribunal — Interpretation — Arbitration clause — Arbitration in Iran — Arbitration proceedings subject to control by Iranian courts — Whether sufficient to exclude jurisdiction of Tribunal — The law and practice of the Iran-United States Claims Tribunal