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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. 72.
Art. 72. During the continuance of hostilities, and for humanitarian reasons, belligerents may conclude agreements with a view to the direct repatriation or accommodation in a neutral country of prisoners of war in good health who have been in captivity for a long time.