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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 VI: Duties of belligerents towards neutral States and duties of neutrals towards belligerent States. - Art. 39.
Art. 39. Belligerent aircraft are bound to respect the rights of neutral Powers and to abstain, within the jurisdiction of a neutral State, from all acts which it is the duty of such State to prevent.