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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part III : Captivity #Section IV : Relations of prisoners of war with the exterior - Art. 41.
Art. 41. Belligerents shall accord all facilities for the transmission of documents destined for prisoners of war or signed by them, in particular powers of attorney and wills.
They shall take the necessary measures to secure, in case of need, the legalisation of signatures of prisoners.