Article 7

1. If three arbitrators are to be appointed, each party shall appoint one arbitrator. The two arbitrators thus appointed shall choose the third arbitrator who will act as the presiding arbitrator of the tribunal.

2. If within thirty days after the receipt of a party's notification of the appointment of an arbitrator the other party has not notified the first party of the arbitrator he has appointed:

(a) The first party may request the appointing authority previously designated by the parties to appoint the second arbitrator; or

(b) If no such authority has been previously designated by the parties, or if the appointing authority previously designated refuses to act or fails to appoint the arbitrator within thirty days after receipt of a party's request therefor, the first party may request the Secretary-General of the Permanent Court of Arbitration at the Hague to designate the appointing authority. The first party may then request the appointing authority so designated to appoint the second arbitrator. In either case, the appointing authority may exercise its discretion in appointing the arbitrator.

3. If within thirty days after the appointment of the second arbitrator the two arbitrators have not agreed on the choice of the presiding arbitrator, the presiding arbitrator shall be appointed by an appointing authority in the same way as a sole arbitrator would be appointed under article 6.