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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part IV : End of captivity #Section I : Direct repatriation and accommodation in a neutral country - Art. 73.
Art. 73. The expenses of repatriation or transport to a neutral country of prisoners of war shall be borne, as from the frontier of the detaining Power, by the Power in whose armed forces such prisoners served.