Article XI
Any Contracting Government may withdraw from this Convention on June thirty of any year by giving notice on or before January first of the same year to the depositary Government, which upon receipt of such a notice shall at once communicate it to the other Contracting Governments. Any other Contracting Government may, in like manner, within one month of the receipt of a copy of such a notice from the depositary Government, give notice of the withdrawal, so that the Convention shall cease to be in force on June thirtieth of the same year with respect to the Government giving such notice of withdrawal. This Convention shall bear the date on which it is opened for signature and shall remain open for signature for a period of fourteen days thereafter.