Arbitration — Law Applied by Arbitral Tribunals — Arbitration between Government and Foreign Company — Law Applicable by Arbitral Tribunal in Relation to Contract between a Government and a Foreign Company — Procedure Applicable — Contract for Supply of Goods to a Government — Legal Character of Administrative Contracts — Interdependent Contracts — Unpaid Loans and Supply Agreement — Effect on Duration of Validity of Agreement — Restrictive Interpretation of Administrative Agreements — Effect of Suspension of Supply Contract During War — Force Majeure — Unforeseen Circumstances and Clausula Rebus Sic Stantibus.