(a) The Tribunal shall decide the substance of the dispute in accordance with the law or rules of law chosen by the parties. Any designation of the law of a given State shall be construed, unless otherwise expressed, as directly referring to the substantive law of that State and not to its conflict of laws rules. Failing a choice by the parties, the Tribunal shall apply the law or rules of law that it determines to be appropriate. In all cases, the Tribunal shall decide having due regard to the terms of any relevant contract and taking into account applicable trade usages. The Tribunal may decide as amiable compositeur or ex aequo et bono only if the parties have expressly authorized it to do so.
(b) The law applicable to the arbitration shall be the arbitration law of the place of arbitration, unless the parties have expressly agreed on the application of another arbitration law and such agreement is permitted by the law of the place of arbitration.
(c) An Arbitration Agreement shall be regarded as effective if it conforms to the requirements concerning form, existence, validity and scope of either the law or rules of law applicable in accordance with paragraph (a), or the law applicable in accordance with paragraph (b).
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