1. Once this Protocol is in force, any Party may, by notification to the Secretary- General of the United Nations, request that a conference be convened for the purpose of reviewing this Protocol. The Secretary-General shall notify all Parties of the request and a review conference shall be convened by the Secretary-General if, within a period of four months following the date of notification by the Secretary- General, not less than one fourth of the Parties to this Protocol notify him of their concurrence with the request.