60In the case of international agreements, it is settled that such agreements concluded by the European Union form an integral part of its legal order and can therefore be the subject of a request for a preliminary ruling (see to this effect, inter alia, Case 181/73 Haegeman [1974] ECR 449, paragraphs 4 to 6; Case 12/86 Demirel [1987] ECR 3719, paragraph 7; and Case C-431/05 Merck Genéricos - Produtos Farmacêuticos [2006] ECR I-7001, paragraph 31).
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