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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section V : On the rights and duties of the belligerent with regard to individuals - Art. 57.
Art. 57. The names of the persons retaining their liberty on condition of the promise provided for by the preceding article, are notified by the belligerent captor to the other belligerent. The latter is forbidden knowingly to employ the said persons.