’s terms of reference, established by the arbitral tribunal, shall be communicated to the parties.
2. The parties shall give the expert any relevant information or produce for his inspection any relevant documents or goods that he may require of them. Any dispute between a party and such expert as to the relevance of the required information or production shall be referred to the arbitral tribunal for decision.
3. Upon receipt of the expert’s report, the arbitral tribunal shall communicate a copy of the report to the parties who shall be given the opportunity to express, in writing, their opinion on the report. A party shall be entitled to examine any document on which the expert has relied in his report.
4. At the request of either party, the expert, after delivery of the report, may be heard at a hearing where the parties shall have the opportunity to be present and to interrogate the expert. At this hearing, either party may present expert witnesses in order to testify on the points at issue. The provisions of article (25) shall be applicable to such proceedings.

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Article 28
1. If, within the period of time fixed by the arbitral tribunal, the claimant has failed to communicate his statement of claim without showing sufficient cause for such failure, the arbitral tribunal shall issue an order for the termination of the arbitral proceedings. If, within the period of time fixed by the arbitral tribunal, the respondent has failed to communicate his statement of defence without showing sufficient cause for such failure, the arbitral tribunal shall order that the proceedings continue.