him; all acts of disposal by sale or exchange of a person acquired with a view to being sold or exchanged; and, in general, every act of trade or transport in slaves by whatever means of conveyance. Section V. - Cooperation between States Parties and communication of information Article 8 1. The States Parties to this Convention undertake to co-operate with each other and with the United Nations to give effect to the foregoing provisions. 2. The Parties undertake to communicate to the Secretary-General of the United Nations copies of any laws, regulations and administrative measures enacted or put into effect to implement the provisions of this Convention. 3. The Secretary-General shall communicate the information received under paragraph 2 of this article to the other Parties and to the Economic and Social Council as part of the documentation for any discussion which the Council might undertake with a view to making further recommendations for the abolition of slavery, the slave trade or the institutions and practices which are the subject of this Convention. Section VI. - Final clauses Article 9 No reservations may be made to this Convention. Article 10 Any dispute between States Parties to this Convention relating to its interpretation or application, which is not settled by negotiation, shall be referred to the International Court of Justice at the request of any one of the parties to the dispute, unless the parties concerned agree on another mode of settlement. Article 11 1. This Convention shall be open until 1 July 1957 for signature by any State Member of the United Nations or of a specialized agency. It shall be subject to ratification by the signatory States, and the instruments of ratification shall be deposited with the Secretary-General of the United Nations, who shall inform each signatory and acceding State. 2. After 1 July 1957 this Convention shall be open for accession by any State Member of the United Nations or of a specialized agency, or by any other State to which an invitation to accede has been addressed by the General Assembly of the United Nations. Accession shall be effected by the deposit of a formal instrument with the Secretary-General of the United Nations, who shall inform each signatory and acceding State. Article 12 1. This Convention shall apply to all non-self-governing trust, colonial and other non-metropolitan territories for the international relations of which any State Party is responsible; the Party concerned shall, subject to the provisions of paragraph 2 of this article, at the time of signature, ratification or accession declare the nonmetropolitan territory or territories to which the Convention shall apply ipso facto as a result of such signature, ratification or accession. 2. In any case in which the previous consent of a non-metropolitan territory is required by the constitutional laws or practices of the Party or of the non-metropolitan territory, the Party concerned shall endeavour to secure the needed consent of the non-metropolitan territory within the period of twelve months from the date of signature of the Convention by the metropolitan State, and when such consent has been obtained the Party shall notify the Secretary-General. This Convention shall apply to the territory or territories named in such notification from the date of its receipt by the Secretary-General. 3. After the expiry of the twelve-month period mentioned in the preceding paragraph, the States Parties concerned shall inform the Secretary-General of the results of the consultations with those non-metropolitan territories for whose international relations they are responsible and whose consent to the application of this Convention may have been withheld. Article 13 1. This Convention shall enter into force on the date on which two States have become Parties thereto. 2. It shall thereafter enter into force with respect to each State and territory on the date of deposit of the instrument of ratification or accession of that State or notification of application to that territory. Article 14 1. The application of this Convention shall be divided into successive periods of three years, of which the first shall begin on the date of entry into force of the Convention in accordance with paragraph 1 of article 13. 2. Any State Party may denounce this Convention by a notice addressed by that State to the Secretary-General not less than six months before the expiration of the current three-year period. The Secretary-General shall notify all other Parties of each such notice and the date of the receipt thereof. 3. Denunciations shall take effect at the expiration of the current three-year period.