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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #I. Hostilities #A. Rules of conduct with regard to individuals #(g) Parlementaires - Art. 27.
Art. 27. A person is regarded as a parlementaire and has a right to inviolability who has been authorized by one of the belligerents to enter into communication with the other, and who advances bearing a white flag.