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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part I : General provisions - Art. 4.
Art. 4. The detaining Power is required to provide for the maintenance of prisoners of war in its charge.
Differences of treatment between prisoners are permissible only if such differences are based on the military rank, the state of physical or mental health, the professional abilities, or the sex of those who benefit from them.