Artikel 18

1. Any Government may, at the time of ratification or accession or at any time thereafter, declare that this Agreement shall extend to any territory or territories for the international relations of which it is responsible, provided that it has undertaken in relation thereto such obligations as are mentioned in paragraph (1) of Article 17.
2. Such extension shall be made by a notification addressed to the Government of the Kingdom of the Netherlands.
3. The extension shall take effect on the 90th day following the day upon which the notification was received by the Government of the Kingdom of the Netherlands, but not before the date of entry into force as defined in Article 16.