67It is true that the obligation on a national court to refer to the content of a directive when interpreting and applying the relevant rules of domestic law is limited by general principles of law, particularly those of legal certainty and non-retroactivity, and that obligation cannot serve as the basis for an interpretation of national law that is contra legem (judgment of 23 April 2009, Angelidaki and Others, C‑378/07 to C‑380/07, EU:C:2009:250, paragraph 199).
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