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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
The situations provided for in Articles 2
shall give immediate effect to ratifications deposited and accessions notified by the Parties to the conflict before or after the beginning of hostilities or occupation. The Swiss Federal Council shall communicate by the quickest method any ratifications or accessions received from Parties to the conflict.
Commentary of 1958