Article 29 1. Any State Party to this Convention may propose an amendment and file it with the SecretaryGeneral of the United Nations. The Secretary General shall thereupon communicate the proposed amendment to the States Parties with a request that they notify him whether they favour a conference of States Parties for the purpose of considering an d voting upon the proposal. In the event that within four months from the date of such communication at least one third of the States Parties favours such a conference, the Secretary General shall convene the conference under the auspices of the United Nations. Any amendment adopted by a majority of the States Parties present and voting at the conference shall be submitted by the Secretary-General to all the States Parties for acceptance. 2. An amendment adopted in accordance with paragraph I of this article shall enter into force when two thirds of the States Parties to this Convention have notified the SecretaryGeneral of the United Nations that they have accepted it in accordance with their respective constitutional processes. 3. When amendments enter into force, they shall be binding on those States Parties which have accepted them, other States Parties still being bound by the provisions of this Convention and anyearlier amendments which they have accepted. Article 30 1. Any dispute between two or more States Parties concerning the interpretation or application of this Convention which cannot be settled through negotiation shall, at the request of one of them, be submitted to arbitration. If within six months from thc date of the request for arbitration the Parties are unable to agree on the organization of the arbitration, any one of those Parties may refer the dispute to the International Court of Justice by request in conformity with the Statute of the Court. 2. Each State may, at the time of signature or ratification of this Con vention or accession thereto, declare that it does not consider itself bound by paragraph I of this article. The other States Parties shall not be bound by paragraph I of this article with respect to any State Party having made such a reservation. 3. Any State Party having made a reservation in accordance with paragraph 2 of this article may at any time withdraw this reservation by notification to the Secretary-General of the United Nations. 51