Article 40

1. Declaration made under this Convention shall be addressed to the Secretary-General of the United Nations and shall take effect simultaneously with the entry of this Convention into force in respect of the State concerned, except declarations made thereafter. The latter declarations shall take effect on the first day of the month following the expiration of six months after the date of their receipt by the Secretary-General of the United Nations.

2. Any State which has made a declaration under this Convention may withdraw it at any time by a notification addressed to the Secretary-General of the United Nations. Such withdrawal shall take effect on the first day of the month following the expiration of six months after the date of the receipt of the notification by the Secretary-General of the United Nations. In the case of a declaration made under article 34 of this Convention, such withdrawal shall also render inoperative, as from the date on which the withdrawal takes effect, any reciprocal declaration made by another State under that article.