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Rules concerning the Control of Wireless Telegraphy in Time of War and Air Warfare. Drafted by a Commission of Jurists at the Hague, December 1922 - February 1923.
Part II: Rules of Air Warfare#Chapter V: On Military Authority over enemy and neutral aircraft and persons on board. - Art. 32.
Art. 32. Enemy public aircraft other than those which are treated on the same footing as private aircraft are liable to confiscation without prize proceedings.