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Convention on Maritime Neutrality. Havana, 20 February 1928.
Section II : Duties and rights of belligerents - Art. 9.
Art. 9. Damaged belligerent ships shall not be permitted to make repairs in neutral ports beyond those that are essential to the continuance of the voyage and which in no degree constitute an increase in its military strength.
Damages which are found to have been produced by the enemy's fire shall in no case be repaired.
The neutral state shall ascertain the nature of the repairs to be made and will see that they are made as rapidly as possible.