Artikel 17

1. Any State which has not signed the Convention may accede thereto at any time after the Convention has entered into force, provided that three-fourths of the Contracting Parties and signatory Governments agree to the proposed accession. When one year has elapsed after the entry into force of the Convention, the agreement of three-fourths of the Contracting Parties only shall be required.
2. Accession shall be effected by the deposit of an instrument of accession with the Government of the United Kingdom of Great Britain and Northern Ireland. The Convention shall enter into force for each acceding State on the ninetieth day after the deposit of its instrument of accession.
3. At any time up to the entry into force of the Convention for a State which accedes under this Article, a Contracting Party may make a reservation to paragraphs 5 and 6 of Article 9 with respect to that State.