Artikel 18

(a). Any High Contracting Party may at the time of its ratification of or accession to this Convention or at any time thereafter declare by written notification to the Belgian Ministry of Foreign Affairs that the Convention shall extend to any of the territories for whose international relations it is responsible. The Convention shall six months after the date of the receipt of such notification by the Belgian Ministry of Foreign Affairs extend to the territories named therein, but not before the date of the coming into force of the Convention in respect of such High Contracting Party.
(b). A High Contracting Party which has made a declaration under paragraph a) of this Article extending the Convention to any territory for whose international relations it is responsible may at any time thereafter declare by notification given to the Belgian Ministry of Foreign Affairs that the Convention shall cease to extend to such territory and the Convention shall one year after the receipt of the notification by the Belgian Ministry of Foreign Affairs cease to extend thereto.
(c). The Belgian Ministry of Foreign Affairs shall inform through diplomatic channels all signatory and acceding States of any notification received by it under this Article.