4. The joinder, intervention or joinder for the claim of indemnity may only be permitted by the arbitral tribunal, having heard the parties and the third party, if the third party accedes to the arbitration agreement by an agreement in writing between him and the parties to the arbitration agree­ment. On the grant of request for joinder, interventi­on or joinder for the claim of indemnity, the third party becomes a party to the arbitral proceedings.

5. In case of a request or notice as referred to in para­graphs (1) and (3), respectively, the arbitral tribunal may suspend the proceedings. After the suspension, the procee­dings shall be resumed in the manner as determined by the arbitral tribu­nal, unless the parties have agreed otherwise.

6. The provisions on the costs of the arbitration contai­ned in the sixth section shall apply accordingly to a third party who has acceded to the arbitration agreement in accordance with the provisions of paragraph (4).

Article 42 - Non-Compliance of a Party with Provisions