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1. Other States which are members of the United Nations, of one of the Specialized Agencies or of the International Atomic Energy Agency or which are Parties to the Statute of the International Court of Justice may be authorized to accede to this Convention.
2. Any request to this effect shall be communicated to the Director-General of the United Nations Educational, Scientific and Cultural Organization who shall transmit it to the Contracting States at least three months before the meeting of the ad hoc committee referred to in paragraph 3 of this article.
3. The Contracting States shall meet as an ad hoc committee comprising one representative for each Contracting State, with an express mandate from his government to consider such a request. In such cases, the decision of the committee shall require a two-thirds majority of the Contracting States.
4. This procedure shall apply only when the Convention has been ratified by at least 20 of the States referred to in article 15.