54In that regard, it should first of all be borne in mind that, although, by virtue of the very nature of regulations and of their function in the system of sources of EU law, the provisions of regulations generally have immediate effect in the national legal systems, without the need for the national authorities to adopt implementing measures, some of their provisions may nevertheless require, for their application, the adoption of implementing measures by the Member States (see, to that effect, inter alia, Case C‑592/11 Ketelä EU:C:2012:673, paragraph 35 and the case-law cited).
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