37It should also be recalled that where, in the absence of EU rules governing the matter, it is for the legal system of each Member State to designate the courts and tribunals having jurisdiction and to lay down the detailed procedural rules governing actions for safeguarding rights which individuals derive from EU law, those detailed rules must not be less favourable than those governing similar domestic actions (principle of equivalence) and must not make it in practice impossible or excessively difficult to exercise rights conferred by EU law (principle of effectiveness) (judgment in Bund für Umwelt und Naturschutz Deutschland, Landesverband Nordrhein-Westfalen, C‑115/09, EU:C:2011:289, paragraph 43).
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