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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part VIII : Execution of the convention #Section I : General provisions - Art. 83.
Art. 83. The High Contracting Parties reserve to themselves the right to conclude special conventions on all questions relating to prisoners of war concerning which they may consider it desirable to make special provisions.
Prisoners of war shall continue to enjoy the benefits of these agreements until their repatriation has been effected, subject to any provisions expressly to the contrary contained in the above-mentioned agreements or in subsequent agreements, and subject to any more favourable measures by one or the other of the belligerent Powers concerning the prisoners detained by that Power.
In order to ensure the application, on both sides, of the provisions of the present Convention, and to facilitate the conclusion of the special conventions mentioned above, the belligerents may, at the commencement of hostilities, authorize meetings of representatives of the respective authorities charged with the administration of prisoners of war.