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Convention for the Amelioration of the Condition of the Wounded and Sick in Armies in the Field. Geneva, 6 July 1906.
Chapter III : Personnel - Art. 11.
Art. 11. A recognized society of a neutral state can only lend the services of its sanitary personnel and formations to a belligerent with the prior consent of its own government and the authority of such belligerent. The belligerent who has accepted such assistance is required to notify the enemy before making any use thereof.