International law in general — Sources — Rule embodied in specific treaty — Other rules of international law — Their relationship — Supremacy of one rule over another.

Aliens — Position of — Property of — Quasi — expropriatory measures — Under specific treaty provisions — Whether subject to challenge under other rules of international law.

Arbitration — Procedure — Competence — Arbitral Commission on Property, Rights and Interests in Germany.

Arbitration — In general — Law applied by arbitral tribunals — Arbitral Commission on Property, Rights and Interests in Germany — Application of specific Treaty bearing on matters falling under Commission's jurisdiction — Application of other rules of international law.