Case C-518/16: Judgment of the Court (First Chamber) of 28 February 2018 (request for a preliminary ruling from the Sofiyski gradski sad — Bulgaria) — ‘ZPT’ AD v Narodno sabranie na Republika Bulgaria, Varhoven administrativen sad, Natsionalna agentsia za prihodite (Reference for a preliminary ruling — State aid — Regulation (EC) No 1998/2006 — Article 35 TFEU — De minimis aid in the form of tax relief — National legislation excluding investments in the production of goods intended for export from the benefit of that tax relief)