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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Annex II : Draft regulations concerning collective relief - Art. 7.
The High Contracting Parties, and the Detaining Powers in particular, shall, so far as is in any way possible and subject to the regulations governing the food supply of the population, authorize purchases of goods to be made in their territories for the distribution of collective relief to the internees. They shall likewise facilitate the transfer of funds and other financial measures of a technical or administrative nature taken for the purpose of making such purchases.
Commentary of 1958