3. At any time during the arbitral proceedings the arbitral tribunal may require the parties to produce documents, exhibits or other evidence within such a period of time as the tribunal shall determine.

Article 25

1. In the event of an oral hearing, the arbitral tribunal shall give the parties adequate advance notice of the date, time and place thereof.

2. If witnesses are to be heard, at least fifteen days before the hearing each party shall communicate to the arbitral tribunal and to the other party the names and addresses of the witnesses he intends to present, and the subject upon and the languages in which such witnesses will give their testimony.

3. The arbitral tribunal shall make arrangements for the translation of oral statements made at a hearing and for a record of the hearing if either is deemed necessary by the tribunal under the circumstances of the case, or if the parties have agreed thereto and have communicated such agreement to the tribunal at least fifteen days before the hearing.