Article 73 Relationship between the present Convention and other international agreements 1. The provisions of the present Convention shall not affect other international agreements in force as between States Parties to them. 2. Nothing in the present Convention shall preclude States from concluding international agreements confirming or supplementing or extending or amplifying the provisions thereof. C HAPTER V. F INAL P ROVISIONS Article 74 Signature The present Convention shall be open for signature by all States Members of the United Nations or of any of the specialized agencies or Parties to the Statute of the International Court of Justice, and by any other State invited by the General Assembly of the United Nations to become a Party to the Convention, as follows: until 31 October 1963 at the Federal Ministry for Foreign Affairs of the Republic of Austria and subsequently, until 31 March 1964, at the United Nations Headquarters in New York. Article 75 Ratification The present Convention is subject to ratification. The instruments of ratification shall be deposited with the Secretary-General of the United Nations. Article 76 Accession The present Convention shall remain open for accession by any State belonging to any of the four categories mentioned in article 74. The instruments of accession shall be deposited with the SecretaryGeneral of the United Nations. Article 77 Entry into force 1. The present Convention shall enter into force on the thirtieth day following the date of deposit of the twenty-second instrument of ratification or accession with the Secretary-General of the United Nations. 2. For each State ratifying or acceding to the Convention after the deposit of the twenty-second instrument of ratification or accession, the Convention shall enter into force on the thirtieth day after deposit by such State of its instrument of ratification or accession. 28