Artikel 13

1. The Contracting Parties shall meet together when necessary in order to consider the operation of the present Convention and, in particular, in order to consider measures to secure uniformity in the interpretation and application of the present Convention.
2. Such meetings shall be convened by the Secretary General of the Council at the request of any Contracting Party; provided that where the matter to be considered concerns only one or more Annexes for the time being in force, such request may be made only by a Contracting Party which is bound in respect of such Annex or Annexes. Unless the Contracting Parties concerned otherwise decide, the meetings shall be held at the Headquarters of the Council.
3. The Contracting Parties shall lay down the rules of procedure for their meetings. Decisions of the Contracting Parties shall be taken by a majority of not less than two-thirds of the Contracting Parties present at the meeting and voting, provided that only those Contracting Parties which are bound by any Annex for the time being in force shall be entitled to vote on matters concerning that Annex.
4. The Contracting Parties concerned shall not take a decision on any matter unless more than half of them are present.