10 Article 18 Entry into force 1. The present Protocol shall enter into force three months after the date of the deposit with the Secretary-General of the United Nations of the tenth instrument of ratification or accession. 2. For each State ratifying or acceding to the present Protocol, after the deposit of the tenth instrument of ratification or accession, the protocol shall enter into force three months after the date of the deposit of its instrument of ratification or accession. Article 19 Amendments 1. Any State Party may propose an amendment to the present Protocol and submit it to the Secretary-General of the United Nations. The Secretary-General shall communicate any proposed amendments to States Parties, with a request to be notified whether they favour a meeting of States Parties for the purpose of considering and deciding upon the proposals. In the event that, within four months from the date of such communication, at least one third of the States Parties favour such a meeting, the Secretary-General shall convene the meeting under the auspices of the United Nations. Any amendment adopted by a majority of two thirds of the States Parties present and voting shall be submitted by the Secretary-General to the General Assembly for approval and thereafter to all States Parties for acceptance. 2. An amendment adopted and approved in accordance with paragraph 1 of this article shall enter into force on the thirtieth day after the number of instruments of acceptance deposited reaches two thirds of the number of States Parties at the date of adoption of the amendment. Thereafter, the amendment shall enter into force for any State Party on the thirtieth day following the deposit of its own instrument of acceptance. An amendment shall be binding only on those States Parties which have accepted it. Article 20 Denunciation 1. Any State Party may denounce the present Protocol at any time by written notification addressed to the Secretary-General of the United Nations. Denunciation shall take effect six months after the date of receipt of the notification by the Secretary-General. 2. Denunciation shall be without prejudice to the continued application of the provisions of the present Protocol to any communication submitted under articles 2 and 10 or to any procedure initiated under article 11 before the effective date of denunciation.