Judgment_paragraph 39 · A v B and Others (C-112/13)

39In the light of the case law referred to in paragraphs 35 to 38 above, the functioning of the system of cooperation between the Court of Justice and the national courts established by Article 267 TFEU requires, as does the principle of primacy of EU law, the national court to be free to refer to the Court for a preliminary ruling any question that it considers necessary, at whatever stage of the proceedings it considers appropriate, even at the end of an interlocutory procedure for the review of constitutionality (see, to that effect, Melki and Abdeli, EU:C:2010:363, paragraphs 51 and 52).