Case C-136/12: Judgment of the Court (Fourth Chamber) of 18 July 2013 (request for a preliminary ruling from the Consiglio di Stato — Italy) — Consiglio nazionale dei geologi v Autorità garante della concorrenza e del mercato and Autorità garante della concorrenza e del mercato v Consiglio nazionale dei geologi (Third paragraph of Article 267 TFEU — Scope of the obligation on courts of final instance to make a reference for a preliminary ruling — Article 101 TFEU — Code of conduct of a professional association prohibiting the application of fee scales which are not commensurate with the dignity of the profession)