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Draft International Convention on the Condition and Protection of Civilians of enemy nationality who are on territory belonging to or occupied by a belligerent. Tokyo, 1934.
Chapter II: Enemy civilians in the territory of a belligerent#Section I: General Provisions - Art. 7.
Article 7.- Subject to the measures applied to the population in general, enemy civilians shall have the possibility of giving news of a strictly private character to next of kin, and of receiving such news.
With the same reservation they shall also have the possibility of receiving relief.