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Manual of the Laws of Naval War. Oxford, 9 August 1913.
Section III : On means of injuring the enemy - Art. 23.
Art. 23. When automatic contact mines, anchored or unanchored, are employed, every precaution must be taken for the security of peaceful shipping. The belligerents must do their utmost to render these mines harmless within a limited time. Should the mines cease to be under surveillance, the belligerents shall notify the danger zones. as soon as military exigencies permit, by a notice addressed to ship-owners, which must also be communicated to the governments through the diplomatic channel.