(3) Differences which may arise in practice over the interpretation of the terms used in this Agreement or in any subsequent agreement called for in implementation of the Annexes to this Agreement may, additionally, be referred at the initiative of any State concerned to binding expert solution, conducted by a single expert (who shall not be a national of any party to this Agreement) to be appointed by agreement between the parties in dispute or, in the absence of agreement, by the President of the Court of Conciliation and Arbitration within the OSCE.