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 — Reference to arbitration — Whether equivalent to submission to Iranian courts — Enforceability of forum selection clauses — Whether Tribunal entitled to consider enforceability — The law and practice of the Iran-United States Claims Tribunal