27The implementation of that system of control is a matter for both the Commission and the national courts, their respective roles being complementary but separate (see, to that effect, Case C-39/94 SFEI and Others [1996] ECR I-3547, paragraph 41; Joined Cases C-261/01 and C-262/01 van Calster and Others [2003] ECR I-12249, paragraph 74, and Case C-368/04 Transalpine Ölleitung in Österreich [2006] ECR I-9957, paragraphs 36 and 37).
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