51Within the framework of those powers, the limits of which must be determined by reference amongst other things to the essential general aims of the legislation in question, the Commission is authorised to adopt all the measures which are necessary or appropriate for the implementation of the basic legislation, provided that they are not contrary to it (see, to that effect, Case C-478/93 Netherlands v Commission [1995] ECR I-3081, paragraphs 30 and 31, and Case C-159/96 Portugal v Commission [1998] ECR I-7379, paragraphs 40 and 41).
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