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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section IV : On the rights and duties of the belligerent with regard to enemy property - Art. 42.
Art. 42. Hospital ships, equipped wholly or in part at the expense of private individuals or officially recognized relief societies, shall likewise be respected and exempt from capture, if the belligerent Power to whom they belong has given them an official commission and has notified their names to the hostile Power at the commencement of or during hostilities, and in any case before they are employed.
These ships must be provided with a certificate from competent authorities declaring that the vessels have been under their control while fitting out and on final departure.
The ships in question shall be distinguished by being painted white outside with a horizontal band of red about a metre and a half (five feet) in breadth.
They are subject to the regulations laid down for military hospital ships by Article 41