Article 39 Entry into force 1. This Convention shall come into force on the ninetieth day following the day of deposit of the sixth instrument of ratification or accession. 2. For each State ratifying or acceding to the Convention after the deposit of the sixth instrument of ratification or accession, the Convention shall enter into force on the ninetieth day following the date of deposit by such State of its instrument of ratification or accession. Article 40 Denunciation 1. Any Contracting State may denounce this Convention at any time by a notification addressed to the Secretary-General of the United Nations. 2. Such denunciation shall take effect for the Contracting State concerned one year from the date upon which it is received by the Secretary-General of the United Nations. 3. Any State which has made a declaration or notification under article 36 may, at any time thereafter, by a notification to the Secretary-General of the United Nations, declare that the Convention shall cease to extend to such territory one year after the date of receipt of the notification by the Secretary-General. Article 41 Revision 1. Any contracting State may request revision of this Convention at any time by a notification addressed to the Secretary-General of the United Nations. 2. The General Assembly of the United Nations shall recommend the steps, if any, to be taken in respect of such request. Article 42 Notifications by the Secretary-General of the United Nations The Secretary-General of the United Nations shall inform all Members of the United Nations and non-Member States referred to in article 35: (a) Of signatures, ratifications, and accessions in accordance with article 35; (b) Of declarations and notifications in accordance with article 36; (c) Of reservations and withdrawals in accordance with article 38; (d) Of the date on which this Convention will come into force in accordance with article 39; (e) Of denunciations and notifications in accordance with article 40; (f) Of requests for revision in accordance with article 41. In faith whereof the undersigned, duly authorized, have signed this Convention on behalf of their respective Governments. Done at New York, this …………day of September, one thousand nine hundred and fifty-four, in a single copy, of which the English, French and Spanish texts are equally authentic and which shall remain deposited in the archives of the United Nations, and certified true copies of which shall be delivered to all Members of the United Nations and to the non Member States referred to in article 35.