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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part III : Captivity #Section V : Relations between prisoners of war and the authorities #Chapter 3 : Penal sanctions with regard to prisoners of war #II. Disciplinary punishments - Art. 57.
Art. 57. Prisoners of war undergoing disciplinary punishment shall be permitted to read and write and to send and receive letters.
On the other hand, it shall be permissible not to deliver parcels and remittances of money to the addressees until the expiration of the sentence. If the undelivered parcels contain perishable foodstuffs, these shall be handed over to the infirmary or to the camp kitchen.